(archaic, now poetic) farewell; goodbye

but (literary form)

and; and then; and therefore / so; if so; as it is; in that way / however; but / a certain thing; a sort of thing

indicates a state (no specific semantic content)

resounding (of bells, stones, musical instruments, etc)

(mechanics) aerodynamics

(exercise) wall squat / A group activity where a ring of people attempt to maintain the position of "sitting" on the lap of the person behind them.

(colloquial) current boyfriend

air gun

(colloquial) unable to pick up on social cues or the situation; lacking social awareness or situational awareness