Here's what rhymes with summarizing.
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arriving deriving diving writhing tithing dicing knifing driving surviving pricing thriving enticing slicing conniving striving sacrificing reviving splicing contriving depriving apprenticing streptomycin writing dying fighting lying buying firing mining riding dining filing guiding hiding lighting lining shining timing abiding assigning biting citing hiring liking signing typing piling piping tying wiping wiring dyeing hiking rhyming siding sighing sighting tiring undying untiring whining alighting aligning fancying pining righting siting vying biding biking chiding fining liming whiting shying viking knighting maligning seining tiding wining finding trying binding underlying applying crying flying smiling acquiring climbing combining deciding drying lightning sliding supplying winding admiring inviting refining ageing aspiring confining frying gliding obliging undermining compiling confiding inciting plying priming prying spying underwriting bribing certifying colliding divining minding styling subsiding twining underlining blighting griping hireling rifling slighting sniping spiking unsmiling unwinding indicting ossifying ramifying bandying eliding opining priding retyping providing striking defining exciting denying designing dividing occupying grinding implying inspiring modifying relying residing retiring trifling uniting blinding overlying overriding reciting signifying unifying ascribing coinciding complying conspiring defying edifying horrifying inclining magnifying resigning rewriting stifling striding verifying amplifying beguiling delighting igniting notifying perspiring ratifying sanctifying nullifying pacifying repining subdividing uninviting belying deriding enshrining exiling nonbinding overwriting personifying unedifying unexciting declining satisfying gratifying presiding reminding specifying terrifying classifying justifying qualifying reconciling replying expiring reclining simplifying subscribing disliking diversifying prophesying decrying falsifying inscribing intertwining mystifying reuniting solidifying stultifying stupefying uninspiring vivifying acidifying calcifying codifying fructifying recombining typifying vilifying describing identifying multiplying clarifying purifying stereotyping testifying fortifying glorifying mortifying quantifying rectifying redefining circumscribing emulsifying expediting redesigning crucifying liquefying prescribing intensifying exemplifying transcribing unsatisfying beautifying disqualifying objectifying proscribing putrefying electrifying indemnifying oversimplifying