Slang Expressions with the letter 'U'

source: Maple Leaf ESL       2016年12月20日
In this lesson, we have a look at the following slang expressions that begin with the letter 'U': up in the air, (be) up to (something), unreal, use/user, up for grabs, underground, up to speed, under wraps, and umpteen/umpteenth.
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