Definitions from Wiktionary (under)

▸ adverb:  In or to a lower or subordinate position, or a position beneath or below something, physically or figuratively.
▸ adverb:  So as to pass beneath something.
▸ adverb:  (usually in compounds) Less than what is necessary to be adequate or suitable; insufficient.
▸ adverb:  (informal) In or into an unconscious state.
▸ adverb:  Down to defeat, ruin, or death.
▸ adjective:  Lower; beneath something.
▸ adjective:  In a state of subordination, submission or defeat.
▸ adjective:  (medicine, colloquial) Under anesthesia, especially general anesthesia; sedated.
▸ adjective:  (informal) Having a particular property that is low, especially so as to be insufficient or lacking in a particular respect.
▸ noun:  The amount by which an actual total is less than the expected or required amount.
▸ noun:  (informal) Something having a particular property that is low or too low.
▸ noun:  (gambling) A bet that a particular sporting statistic, such as points scored in a game, will be below a certain stated value.

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