step in
名词 step in:
short underpants for women or children (usually used in the plural)
同义词:pantie, panty, scanty, step-in
动词 step in:
get involved, so as to alter or hinder an action, or through force or threat of force
同义词:intervene, interfere, interpose
act as a substitute
同义词:substitute, deputize, deputise