Here's what rhymes with underline.
line align aline fine nine sign mine wine assign pine shine shrine thine dine sine undermine vine brine sein tine whine affine malign zine interline design divine decline define alkaline benign spine iodine resign refine supine swine twine centerline proline anticline waterline opine realign stein timberline confine dopamine endocrine borderline incline atropine palatine pyridine thiamine consign hyperfine thymine anodyne enshrine recline asinine entwine intertwine reassign superfine cosign crystalline turpentine concubine cysteine redefine redesign serpentine imipramine monoamine saccharine byzantine calamine crinoline epinephrine exocrine porcupine recombine columbine valentine eglantine celandine disincline reconsign lacustrine neuroendocrine noncrystalline clementine norepinephrine tetracycline polycrystalline Words that almost rhyme with underline
lime rhyme rime time crime prime climb clime dime hym slime beim chime grime heing mime thyme chyme birdlime sublime pantomime anteing begrime maritime paradigm overtime summertime dinnertime wintertime suppertime sauteing mistime anytime lysozyme mesenchyme onetime flexitime environ