AMERICAN IDIOMS STARTING WITH U
Under construction:
Being built or repaired. ex. "This road has been under construction for six months."
Under fire:
Being attacked. ex. "The soldiers came under fire when they approached the city."
Under the table:
Illegally. ex. "Many illegal immigrants try to find work under the table."
Under the weather:
Sick. Ill. ex. "I'm feeling a bit under the weather today."
Up and about:
Recovered from an illness. ex. "Hey it's nice to see you up and about. You must feel a lot better."
Up for grabs
Available for anyone to try to get. ex. "The Swedish telecom market is still up for grabs."
Up in the air:
Uncertain. ex. "His future at this company is up in the air."
Uptight:
Conservative, nervous, nit-picky. "Stop being so uptight, relax a bit!"
Up to it:
Capable of, fit for. ex. "Do you feel up to playing a game of tennis?"
Up to one's neck in something:
Very much involved in something. To have a lot of something. ex. "I can't go out tonight. I'm up to my neck in work."
Up to par:
Meeting normal standards.
(To) use every trick in the book:
To use every method possible.