pitch in
积极参与，做出贡献，帮助做某事
口语·鼓励或描述合作
英文释义
to contribute or help out; to do one's part or share in a task or effort
例句
Everyone pitched in to clean up the kitchen after the party.
典故来源
源自棒球运动，pitch指投球，引申为投入行动，in表示参与，比喻主动加入团队工作。