Etymology
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undulate (v.)

"to move in waves," 1660s, back-formation from undulation. Related: undulated, undulating.

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Definitions of undulate
1
undulate (v.)
stir up (water) so as to form ripples;
Synonyms: ripple / ruffle / riffle / cockle
undulate (v.)
occur in soft rounded shapes;
Synonyms: roll
undulate (v.)
move in a wavy pattern or with a rising and falling motion;
The curtains undulated
Synonyms: roll / flap / wave
undulate (v.)
increase and decrease in volume or pitch, as if in waves;
The singer's voice undulated
2
undulate (adj.)
having a wavy margin and rippled surface;
From wordnet.princeton.edu