THESAURUS
pop in
admit, barge in, be admitted, break in, breeze in, burst in, bust in, call, come barging in, come breezing in, come busting in, come by, come in, come over, creep in, cross the threshold, crowd in, drop, drop in, ease in, edge in, enter, gain admittance, get in, go in, go into, have an entree, have an in, hop in, infuse, inject, inoculate, insert, insinuate, interject, introduce, intromit, intrude, irrupt, jam in, jump in, look in, pack in, perfuse, press in, push in, put in, set foot in, set in, slip in, squeeze in, step in, stick in, stop by, take in, throw in, thrust in, tuck in, visit, wedge in, whip in, work in
ROGET THESAURUS
pop in
Ingress
VB
have the entree, enter, go into, go in, come into, come in, pour into, pour in, flow into, flow in, creep into, creep in, slip into, slip in, pop into,
pop in, break into, break in, burst into, burst in, set foot on, ingress, burst in upon, break in upon, invade, intrude, insinuate itself, interpenetrate, penetrate, infiltrate, find one's way into, wriggle into, worm oneself into, give entrance to, insert.
Insertion
VB
insert, introduce, intromit, put into, run into, import, inject, interject, infuse, instill, inoculate, impregnate, imbue, imbrue, graft, ingraft, bud, plant, implant, dovetail, obtrude, thrust in, stick in, ram in, stuff in, tuck in, press, in, drive in,
pop in, whip in, drop in, put in, impact, empierce, imbed, immerse, immerge, merge, bathe, soak, dip, plunge, bury, insert itself, lodge itself, plunge in medias res.