go under
Pronunciation:
verb
Definitions
To descend into a body of water; to founder.
Example: the boat was too heavy and went under.
To collapse or fail, e.g. by going bankrupt.
Example: In the crisis, the company was forced to reduce its costs in order to avoid going under.
To be named; to call oneself.
Example: He goes under the name of Mr X to remain anonymous.
To enter a state of hypnosis.