set to
(a) begin doing sth energetically 精力充沛地開始做某事
The engineers set to on repair work to the bridge. 工程師奮力進行修橋工作.
If we really set to we can get the whole house cleaned in an afternoon. 我們要是認真干, 一個下午就能把房子打掃乾凈.
(b) begin to fight or argue 開始打斗或爭吵
The boys set to and had to be separated by a teacher. 那些男生大打出手, 來個老師才把他們拉開.