pitch in
積極參與，做出貢獻，幫助做某事
口語·鼓勵或描述合作
英文釋義
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.
典故來源
源自棒球運動，pitch指投球，引申為投入行動，in表示參與，比喻主動加入團隊工作。