go under
Verb
Meaning
be called; go by a certain name
disappear beyond the horizon
go under
Source: WordNetSynonyms
Antonyms
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Examples
Let me die in my footsteps before I go under the ground.
Everybody, sooner or later, will have to go under the knife. Let's hope they make out as well as I did.
I think there is more pressure at trials when you are trying to make the team and you have to come first or second, and you have to go under qualifying time.
If you can't go over, you must go under.
If you can't go over, you must go under.
If you can't go over, go under.