umpteen: an indefinite, large number. (also, umpteenth when used as an ordinal number)

Please, for the umpteenth time–clean up after yourself!

Uncle Sam: the United States government.

If you don’t pay taxes to Uncle Sam by April 15, you’ll have to pay a penalty.

underground: something unconventional or unknown to the general population.

I listened to a lot of underground music when I was in my twenties.

unreal: hard to believe; something amazing.

We got so much snow last night it’s unreal.

up against the wall: in a difficult situation.

Melvin lost his job, and now he’s really up against the wall because he has to pay his rent and he doesn’t have any money.

up and up: honest; truthful.

That salesperson doesn’t seem to be very up and up. We should go to a different car dealer.

up for grabs: available to the first person who wants it or tries to get it.

There’s a bike down the street that’s up for grabs. It has a big sign on it that says, "free."

up in the air: unknown; unplanned;

Our plans for the weekend are still up in the air.

up to here: as much as one can tolerate; an expression of anger or unhappiness with a situation or a person.

I’ve had it up to here with your complaining. Stop it!

up to speed: informed; knowledgable; up to date.

After a two-week vacation, it took Yolanda a few days to get back up to speed at work.

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veg: to do nothing (related to the word "vegetable).

All they want to do on the weekend is sit in front of the TV and veg.

veggie: vegetable.

If you eat a lot of veggies, you’ll live a long healthy life.

vibe: an emotional feeling or reaction, usually from a person.

Stay away from the boss today. He’s sending out a lot of bad vibes.

vid: video

Nice vid! Did you do all the work on it yourself?

vinyl: another name for a record or an album. (Records were replaced by CDs and downloadable digital recordings in the 80s and 90s, but they remain popular among music collectors and enthusiasts.)

Do you have this song on vinyl?

VIP: abbreviation for "very important person."

The VIPs were allowed to get into the nightclub first while everyone else had to wait and stand in line.

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Go to the chat room to practice chatting with other students.