THESAURUS
interpolate
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
ROGET THESAURUS
interpolate
Interposition
VB
lie between, come between, get between, intervene, slide in, interpenetrate, permeate, put between, introduce, import, throw in, wedge in, edge in, jam in, worm in, foist in, run in, plow in, work in, interpose, interject, intercalate,
interpolate, interline, interleave, intersperse, interweave, interlard, interdigitate, sandwich in, fit in, squeeze in, let in, dovetail, splice, mortise, insinuate, smuggle, infiltrate, ingrain, interfere, put in an oar, thrust one's nose in, intrude, obtrude, have a finger in the pie, introduce the thin end of the wedge, thrust in.