room rent

(Internet slang) dirty room

at-home clothes

an adult son residing with his parents; generally has not yet or can not come into family inheritance / a female servant working in a daimyō, ōoku, or other high-ranking house

(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.

air gun

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

compressed air

to sense or guess the mood or atmosphere of one's surroundings; to read the room