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Definitions of undulate:

verb:   increase and decrease in volume or pitch, as if in waves
Example: "The singer's voice undulated"

verb:   occur in soft rounded shapes
verb:   move in a wavy pattern or with a rising and falling motion
Example: "The curtains undulated"

verb:   stir up (water) so as to form ripples
adjective:   having a sinuate margin and rippled surface

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Alternative Terms
undulant undulous undulating serpentine-locomotion camleted nebul-molding-nebuly-molding kinetoplastida cryptobiidae mountain-wave sag-and-swell-topography swell-and-swale-topography till-billow oundy raqs-sharqi

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und/lating , und/ulating , und[lating , und[ulating , und]lating , und]ulating , und'lating , und'ulating , und;lating , und;ulating , undalating , undaulating , undblating , undbulating , undclating , undculating , unddlating , unddulating , undjlating , undjulating , undklating , undkulating , undllating , undlulating , undmlating , undmulating , undnlating , undnulating , undolating , undoulating , undplating , undpulating , unduating , undulating , undueating , unduelating , undurating , undurlating , undusating , unduslating , undutating , undutlating , unduuating , unduulating , unduvating , unduvlating , unduyating , unduylating , unduzating , unduzlating , undufating , unduflating , undugating , unduglating , unduhating , unduhlating , unduiating , unduilating , undu0ating , undu0lating , undu1ating , undu1lating , undu2ating , undu2lating , undu3ating , undu3lating , undu4ating , undu4lating , undu5ating , undu5lating , undu6ating , undu6lating , undu7ating , undu7lating , 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undulatiug , undulatiung , undulativg , undulativng , undulatiyg , undulatiyng , undulatizg , undulatizng , undulatifg , undulatifng , undulatigg , undulatigng , undulatihg , undulatihng , undulatiig , undulatiing , undulati0g , undulati0ng , undulati1g , undulati1ng , undulati2g , undulati2ng , undulati3g , undulati3ng , undulati4g , undulati4ng , undulati5g , undulati5ng , undulati6g , undulati6ng , undulati7g , undulati7ng , undulati8g , undulati8ng , undulati9g , undulati9ng , undulati,g , undulati,ng , undulati.g , undulati.ng , undulati/g , undulati/ng , undulati[g , undulati[ng , undulati]g , undulati]ng , undulati'g , undulati'ng , undulati;g , undulati;ng , undulatiag , undulatiang , undulatibg , undulatibng , undulaticg , undulaticng , undulatidg , undulatidng , undulatijg , undulatijng , undulatikg , undulatikng , undulatilg , undulatilng , undulatimg , undulatimng , undulating , undulatinng , undulatiog , undulationg , undulatipg , undulatipng , undulatin , undulating , 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undulatinn , undulatinng , undulatino , undulatinog , undulatinp , undulatinpg , nudulating , udnulating , unudlating , undluating , undualting , undultaing , undulaitng , undulatnig , undulatign