interpose vs step in

interpose and step in both are verbs.

Word	Noun	Adjective	Verb	Adverb
interpose	No	No	Yes	No
step in	No	No	Yes	No

As verbs, interpose and step in are synonyms defined as:

interpose and step in: get involved, so as to alter or hinder an action, or through force or threat of force

Other synonyms of interpose include interfere, intervene.

interpose (verb)	step in (verb)
to insert between other elements	get involved, so as to alter or hinder an action, or through force or threat of force
to put forth by way of intervention	act as a substitute
be or come between
get involved, so as to alter or hinder an action, or through force or threat of force