"undulate" in the verb sense
1. ripple, ruffle, riffle, cockle, undulate
stir up (water) so as to form ripples
2. roll, undulate
occur in soft rounded shapes
"The hills rolled past"
3. roll, undulate, flap, wave
move in a wavy pattern or with a rising and falling motion
"The curtains undulated"
"the waves rolled towards the beach"
increase and decrease in volume or pitch, as if in waves
"The singer's voice undulated"
"undulate" in the adjective sense
having a wavy margin and rippled surface
Source: WordNet® (An amazing lexical database of English)
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