Occur in soft rounded shapes.
Move in a wavy pattern or with a rising and falling motion:
— The curtains undulated.
Increase and decrease in volume or pitch, as if in waves.
Having a wavy margin and rippled surface.
Moby thesaurus: alternate, bank, be here again, be poised, billow, brandish, break, circle, comb, come again, come and go, come around, come round, come round again, come up again, crab, crash, cycle, dash, dip ... show more.
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