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Related to gone under: gone under the knife
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1. To physically move beneath something. After you go under the bridge and make a right, you'll see the store up ahead.
2. To fail or become defunct. Our company will go under if we lose money again this quarter.
3. To become unconscious, as from anesthesia. After you go under, you'll wake up in the recovery room.
4. To become submerged. Captain, if this boat takes on any more water, it'll go under!
See also: go
See also: gone