verb
1.
Synonyms: introduce 6, fill in, insert, insinuate, intercalate, interject, interpolate, throw in
Related Word: cast, throw, toss; push, shove, thrust
2.
to come between disagreeing elements
forced to interpose when the argument grew heated
Synonyms: intercede, interfere, intermediate, intervene, mediate, step in
Related Word: butt in, interlope, intrude, obtrude; intermeddle, meddle; arbitrate, moderate, negotiate