u2
- unidentified flying object, UFO
+ ultra-high-definition-television, UHDTV
+ TV with a resolution of 3840 pixels, 4K UHDTV
+ 2012, NHK Science & Technology Research Labs and 4K UHDTV
+ the United Kingdom, UK
+ 999, the emergency telephone number in the UK
+ 1937, the emergency telephone system in the UK
+ God Save the Queen, the national anthem of the UK
+ Union Flag, the flag of the UK
+ the Monarch, the Cabinet, and the House of Commons; the Govt. of the UK
- peptic ulcer
+ radius and ulna
- UV, ultraviolet
+ a large sandstone rock formation, Uluru
+ Australia and the Uluru
+ umbrella
+ c. 210 BC, China and the umbrella
+ appealed to the umpire
+ maternal uncle
+ paternal uncle
+ clean and unclean
- the unconscious
- still undecided
+ children of five and under
- to go under
+ the undersigned
+ I understand
+ I can't understand
- I don't understand
+ a worthwhile undertaking
- to wear pants and underwear
- to wear pants without underwear
- left the work undone
- to feel unhappy
+ credit union
+ 1993-present, a political and economic union, the European Union
+ labor union
+ 1886, Gompers and labor union
+ Soviet Union
+ trade union
+ in unison
+ ICU, Intensive Care Unit
+ CPU, Central Processing Unit
+ in unity
+ 88 constellations in our universe
+ the hub of the universe
+ represented by x, y, z; the unknowns
+ the knowns and the unknowns
+ 1637, Descartes, and the knowns and the unknowns
+ to lock and unlock
+ do not unlock
+/- to lock or unlock
- left unsaid
+ sight unseen
- wealth untold
+ to leave no stone unturned
- sensed that I was unwelcome
+ up and up and up
- to break up
+ breaking down and building up
+ to bundle up
+ to cheer up
+ to keep one's chin up
- to cover up
- double up
- to dry up
- to put my feet up
+ to grow up
- Hands up!
- hang up
+ Heads up!
+ liven it up
+ to make it up
+ to pack it up
+ to scale it up
+ to strap it up
+ to tie it up
- tore it up
+ jazz up
+ lining up
+ to move up
+ to pack up
- to pile up
+ not turned over fried egg, sunny side up
+ to sign up
+ to stand up
+ to line them up
+ thumbs up
+ to tune up
+ to turn up
+ to wake up
+ on the upgrade
- a stomach upset
+ an element, uranium
+ 1789, Klaproth and uranium
+ the seventh planet in the solar system, Uranus
+ 1781, W. Herschel and Uranus
+ to go to the bathroom to urinate
+ 6.0 pH of human urine
- incontinence of urine
+/- to drink my own urine
- cinerary urn
+ yellow for urology
+ the United States, US
+ a proud day for us
+ to have mercy on us
+ the 1st Mon. of Sep., Labor Day in the US
+ 1882, Central Labor Union, Knights of Labor, and Labor Day in the US
+ last Monday in May, Memorial Day in the US
+ for all US soldiers who died while serving, Memorial Day in the US
+ 1868, Grand Army of the Republic and Memorial Day in the US
+ 4th Thu. of Nov., Thanksgiving Day in the US
+ Nov. 11, Veterans Day in the US
+ in honor of all US veterans, Veterans Day in the US
+ 911, the emergency telephone number in the US
+ 1968, the emergency telephone system in the US
+ American flag, the flag of the US
+ the President, the Congress, and the Federal Courts; the Govt. of the US
+ 1789-1797, Washington and the first President of the US
+ to take a potluck meal with us
- can sit with us
+ may sit with us
+ the United States of America, USA
+ consisting of 50 states, USA
+ The Star-spangled Banner, the national anthem of the USA
+ modern English usage
- damaged by rough usage
+ Universal Serial Bus, USB
+ the standardization of the connection between the peripherals and computers, USB
+ 1995, Intel and the USB
+ to make myself useful
+ 1922-1991, consisting of 15 republics, USSR
+ Union of Soviet Socialist Republics, USSR
+ my usual
+ the usual
+ public utilities
+ to do my utmost
- a U-shaped path, U-turn
- ultraviolet, UV

v2
+ verb, v.
- no vacancies
+ to take a vacation
+ the length of our vacation
+ paid vacation
+ measles vaccine
+ 1954, Enders, Peebles, and the measles vaccine
+ polio vaccine
+ 1953, Salk and the polio vaccine
+ oral polio vaccine
+ 1955, Sabin and the oral polio vaccine
+ rabies vaccine
+ 1885 Pasteur and the rabies vaccine
+ smallpox vaccine
+ 1796, Jenner and the smallpox vaccine
+ typhus vaccine
+ 1909, Nicolle and the typhus vaccine
- in vain
- to take the Lord's name in vain
+ lily of the valley
- face value
+ food value
+ market value
- nominal value
- to lack of moral values
+ a chest drainage flutter valve, Heimlich valve
+ 1962, Heimlich and the Heimlich valve
+ safety valve
+ police van
+ weather vane
+ a profuse variety
+ the football team representing the school, the football varsity
- junior varsity
+ petroleum jelly, Vaseline
+ 1872, Chesebrough and Vaseline
+ pole vault
+ the day of victory, V-Day
+ to eat more vegetables
- scanty vegetation
+ commercial vehicle
+ motor vehicle
+ multipurpose vehicle
+ RV, recreational vehicle
- beyond the veil
+ to introduce the needle into a vein
+ artery and vein
+ jugular vein
- varicose veins
+ a hook and loop fastener, Velcro
+ 1948, de Mestral and Velcro
+ news vendor
- to take revenge, to take vengeance
+ a play, The Merchant of Venice
+ 1598, Shakespeare and The Merchant of Venice
+ joint venture
+ v., verb
+ SVO; subject, object, and verb
+ chapter and verse
- vs., versus
+ blood vessel
+ to wear a bulletproof vest
+ video home system, VHS
+ 1976, JVC and the VHS
+ relief fund for the earthquake victims
+ moral victory
+ to commemorate the victory
+ 2 hours, 8 GB USB full HD video
+ videodisc
+ videotape
+ a taste of Vietnam
+ a house with a view
+ bird's-eye view
+ in full view
+ point of view
+ side view
- to obstruct the view
- to blot out the view
+ to keep watch, to keep vigil
- a remote village
+ French fries and vinegar
+ a good vintage
- parole violation
- domestic violence
- to promote an atmosphere of violence
- senseless violence
+ to play the violin
- pit viper
+ a sign of the zodiac, the Virgin
+/- vices and virtues
- an ultra-microscopic, filter-passing, self-replicating micro-organism, virus
+ 1892, Ivanovsky and viruses
- a downloaded program without an "uninstall" button, computer virus
- a malicious self-replicating software program, computer virus
- 1949, von Neumann and computer virus
+ transit visa
+ the jaws of a vise
- poor visibility
+ an electronic spreadsheet, VisiCal
+ 1979, Bricklin, Frankston, and the VisiCal
+ field of vision
- tunnel vision
+ twenty-twenty vision
+ a statesman with vision
+ paid them a visit
+ a surprise visit
+ flock of visitors
+ a sun flap, sun visor
+ full of vitality
+ the essential food factors, vitamins
- deficient in vitamins
+ enriched with vitamins
+ a sweater with a V-shaped neckline, V-neck
+ alcoholic liquor distilled from rye, vodka
+ Russia and vodka
+ in fashion, in vogue
+ active voice
+ an agreeable voice
+ a deep voice
+ in good voice
- a harsh voice
- lost her voice
- spoke in a low voice
- shouted at the top of my voice
- to raise my voice
+ with one voice
- passive voice
- a rasping voice
- to declare the agreement null and void
- an active volcano
+ a dormant volcano
+ a team sport, volleyball
+ 1895, Morgan and volleyball
- to step down the voltage
+ to step up the voltage
+ the national anthem of the PRC, March of the Volunteers
+ 1982, Tian, Nie, and the March of the Volunteers
+ a vote cast by an authorized representative, proxy vote
+ a vote taken by the loudness of response, voice vote
+ a, e, i, o, u; vowels
+ maiden voyage
- versus, vs.
+ Biblical Hebrew, Classical Arab, Filipino, Hawaiian...; VSO
+ verb, subject, and object; VSO
- venomous nerve agent X, VX
+ 1952, La-a, Newman, and VX