lose (one's) lunch
slang To vomit. I felt like I was going to lose my lunch from seasickness out on that boat.
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]
lose your lunch
vomit. informal euphemistic 2005 Sunday Times In March, Insanity—the Ride opened at the Stratosphere Hotel, offering a memorable way to lose your lunch. At a height of 906 ft, the ride uses centrifugal force to fling passengers 64 ft out over Sin City.