in. to empty one's stomach; to vomit. : I think I'm going to sick up. Isn't there supposed to be a barf bag in one of these seat pockets?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Telephone one's employer or school that one is ill and cannot come to work or attend. For example, Ben called in sick and told his boss he would miss the meeting. [Mid-1900s]
