Meaning of STEP IN

WordNet Dictionary
	Definition:		[n]  short underpants for women or children (usually used in the plural) [v]  act as a substitute for [v]  get involved, usually so as to hinder or halt an action; "Why did the U.S. not intervene earlier in WW II?"
	Websites:
	Synonyms:		deputise, deputize, interfere, interpose, intervene, pantie, panty, scanty, stand in, substitute
	See Also:		cover, horn in, interact, interlope, intrude into, meddle, meddle with, poke into, replace, supersede, supervene upon, supplant, tamper, underpants