Being lower; being beneath something.
Under anesthesia, especially general anesthesia; sedated.
Ensure the patient is sufficiently under.
In a way lower or less than.
In a way inferior to.
In an unconscious state.
It took the hypnotist several minutes to make his subject go under.
In or at a lower level than.
As a subject of; subordinate to.
He served in World War II under General Omar Bradley.
Less than.
Below the surface of.
In the face of; in response to (some attacking force).
to collapse under stress; to give in under interrogation
As, in the character of.
he writes books under the name John Smith