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Wiktionary
go under

vb. 1 To descend into a body of water; to founder. 2 (context idiomatic English) To collapse or fail, e.g. by going bankrupt. 3 (context idiomatic English) To be named; to call oneself. 4 To enter a state of hypnosis.

WordNet
go under
  1. v. go under, "The raft sank and its occupants drowned" [syn: sink, settle, go down] [ant: float]

  2. disappear beyond the horizon; "the sun sets early these days" [syn: set, go down] [ant: rise]

  3. be called; go by a certain name; "She goes by her maiden name again" [syn: go by]

Usage examples of "go under".

They gave the ship time to clear customs, then had a frogman go under it while it was at the quayside and prise the horse loose.

A dim game trail showed along the mountain, but such trails are often made by animals that can go under low-hanging boughs, and they cannot always be trusted.

The love of digging in the ground (or of looking on while he pays another to dig) is as sure to come back to him as he is sure, at last, to go under the ground, and stay there.

A stone tooth struck her shoulder, and she ducked to go under another.

Nesbitt glared at him, but that was as far as he was prepared to go under Pritchart's cold eye.

Nesbitt glared at him, but that was as far as he was prepared to go under Pritchart’.

Finally his consciousness did go under -- and merciful blackness swallowed everything.

Masked, with the gill-pack, he could go under surface if he were not smashed by the waves against some wall.