One's movements, bearing, or deportment — how a person carries themselves or behaves (including manners and conduct).
上司の前での立ち振る舞いには気を付けなさい。
Be careful about how you conduct yourself in front of your boss.
舞台俳優は日頃から立ち振る舞いを稽古している。
Stage actors regularly practice their movements and carriage.
彼女の落ち着いた立ち振る舞いが、会場の雰囲気を和らげた。
Her calm demeanor eased the atmosphere of the venue.
A farewell dinner or party given by someone who is about to leave (used slightly archaically or in fixed expressions).
出発前に友人たちが立ち振る舞いを催してくれた。
Friends held a farewell dinner for me before I left.