Synonyms and related words :
add, admit, annex, append, drag in, edge in, enter, fill in, foist in, fudge in, implant in, inject in, insert, insert in, insinuate, insinuate in, intercalate, interjaculate, interject, interlope, interpose, intervene, introduce in, intrude, lug in, put between, run in, sandwich, smuggle in, squeeze in, superadd, throw in, thrust in, wedge in, work in, worm in