Here's what rhymes with birthdating.
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staging paging taping trading shaping fading raging gaping lading persuading shading raiding wading waging gauging parading raping braiding draping escaping grading pervading scraping evading engaging invading degrading upgrading blockading cascading masquerading reshaping upbraiding crusading disengaging downgrading taking painting paying staying baking bathing spacing staining basing chasing pacing paving tasting chafing chaining pasting staking tailing taming bailing basting baying making saying training breaking changing playing raising facing laying placing saving failing gaining naming pertaining praying sailing shaking weighing attaining blazing framing gazing racing scaling tracing waking wasting waving ascertaining blaming bracing casing draining fainting flaming gaming mailing obeying praising railing raining reigning shaving spraying straining swaying trailing wailing waning braking phrasing raking raving scathing slaying whaling feigning flaking hailing nailing phasing plaything preying straying veiling braving braying caving disdaining faking flailing haying hazing maiming neighing plaguing shaming strafing waiving obtaining ranging amazing claiming retaining arranging displaying grazing modelling surveying sustaining behaving craving decaying delaying detailing appertaining appraising displacing glazing mistaking partaking abstaining assailing availing awaking curtailing debasing detaining disobeying effacing entailing erasing overtaking quaking repaying allaying assaying bewailing buffeting craning defraying graying ordaining containing remaining explaining maintaining prevailing undertaking replacing embracing entertaining betraying campaigning exchanging restraining unchanging portraying regaining retraining unavailing unfailing acquainting forsaking inhaling refraining remaking renaming unveiling declaiming denaturing disclaiming inflaming retracing revelling complaining conveying engraving proclaiming constraining countervailing exclaiming interlacing mainspring paraphrasing rearranging reclaiming remodelling interchanging overgrazing uncomplaining