Undid rhymes with:
adid, did, redid, adid, amid, bid, cid, counterbid, cyd, did, forbid, grid, hid, id, ihde, kid, kidd, kidde, kyd, lid, madrid, majid, mid, quid, rebid, redid, rid, schmid, sid, skid, slid, smid, squid, stidd, syd, tidd
Undid sounds like:
uinta, unaided, unamended, unanimity, unaudited, und, undated, undo, undue, unedited, unheeded, unimate, unimedia, uninitiated, unit, unita, unite, united, unity, unmade, unmanned, unmet, unnamed, unneeded, unted, untidy, untie, untied, untiedt, unto, unwanted, unwed, unwind, unwound