Idioms and Phrases with lose one's lunch
lose one's lunch
Vomit, as in When Anne saw the wound, she thought she'd lose her lunch. This expression does not usually refer to a specific meal and probably survives because of alliteration. [Colloquial; c. 1940]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.