interpose (one, oneself, or something) between (someone or something)
To place one, oneself, or something between someone or something. I interposed myself between the cat and the door so that she couldn't make a run for it.
interpose (something) in(to) (something)
To introduce something into a particular situation. Please don't interpose your thoughts into this meeting, OK? You're just supposed to be observing.
interpose someone or something between people or things
to put someone or something between people or things, in any combination. I do not wish to interpose Randy between the twins. We will not interpose our own standards between these two warring factions.
interpose something in (to) something
to introduce something into something; to put a question into a conversation. The chairman interposed a question into the discussion. May I interpose an observation in the proceedings?