lift a finger
举手或动一动手指，表示愿意帮助或做某事
口语·批评不帮忙
英文释义
to make an effort or take action, especially in helping or doing something
例句
He never lifts a finger to help with the housework, even when I'm exhausted.
典故来源
字面意为动动手指，表示最小的努力，常用于否定句。