1To behave or conduct oneself in a certain manner, often referring to manners or public conduct.
彼女はどんな時も落ち着いて振る舞う。
She always behaves calmly, no matter the situation.
客の前では丁寧に振る舞うよう心がけている。
I make an effort to behave politely in front of guests.
王様のように振る舞う彼の態度が気に入らない。
I don't like the way he acts like a king.
2To treat guests to food or drink; to entertain them with refreshments.
お祝いに集まった人たちに料理を振る舞った。
We served food to everyone who gathered for the celebration.
花見では近所の人にお酒を振る舞う習慣がある。
There's a custom of treating neighbors to sake during cherry blossom viewing.