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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
swing sinuate slither snake move-halt curl curve wave straight-bent ripple-ruffle-riffle-cockle-undulate ripple ruffle riffle cockle roll-undulate roll undulate-flap-wave flap undulate circumundulate undulary neckeraceae undulating undated billow inundate fluctuate wimple abound redound surround skate-4 crisp

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