v. 1 tr. (often foll. by between) place or insert (a thing) between others. 2 tr. say (words) as an interruption. 3 tr. exercise or advance (a veto or objection) so as to interfere. 4 intr. (foll. by between) intervene (between parties).
[ F interposer f. L interponere put (as INTER-, POSE(1)) ]