Definitions
1.adjectiveBeing lower; being beneath something.
2.adjectiveUnder anesthesia, especially general anesthesia; sedated."Ensure the patient is sufficiently under."
3.adverbIn a way lower or less than.
4.adverbIn a way inferior to.
5.adverbIn an unconscious state."It took the hypnotist several minutes to make his subject go under."
6.prepositionIn or at a lower level than.
7.prepositionAs a subject of; subordinate to."He served in World War II under General Omar Bradley."
8.prepositionLess than.
9.prepositionBelow the surface of.
10.prepositionIn the face of; in response to (some attacking force)."to collapse under stress; to give in under interrogation"
11.prepositionAs, in the character of."he writes books under the name John Smith"