step in

同义
step in interfere interpose intervene
词性
v
解释
get involved, so as to alter or hinder an action, or through force or threat of force
示例
Why did the U.S. not intervene earlier in WW II?

同义
deputise deputize substitute step in
词性
v
解释
act as a substitute
示例
She stood in for the soprano who suffered from a cold