Meaning of undulate

Definition of undulate

(adj) having a wavy margin and rippled surface
(verb) stir up (water) so as to form ripples
occur in soft rounded shapes; "The hills rolled past"
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"

Other information on undulate

WIKIPEDIA results for undulate
Amazon results for undulate