(informal) Somehow, but certainly.

Of critical importance to the survival of a living organism. / Having death as a possible or even likely outcome; perilous. / Of critical importance to the success of a particular endeavor.

All the coordinated physiological responses that the sympathetic nervous system initiates in response to stress or other emergency situations.

Alternative spelling of fight-or-flight

(academia) The pressure to frequently publish in academic journals in order to gain tenure or to sustain a career.

A question suggesting sexual intercourse: literally meaning "shall we go to your place or mine to have sex?"

(sometimes proscribed) He or she; used as a gender-neutral reference to the third person singular.

(colloquial, rhetorical question) Alternative form of am I right, implying the speaker can't possibly be wrong.

Alternative spelling of exclusive or

plural of trick-or-treater