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something's up

something is going to happen; something is going on. Everybody looks very nervous. I think something's up. From the looks of all the activity around here, I think something's up.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

up

1. mod. happy; cheery; not depressed; upbeat. I’m up today. Let’s celebrate.
2. tv. to increase something. She tried to up the price on me, thinking I wouldn’t notice.
3. in. to take a stimulant drug. Ted upped before going in to take the test.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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