definition of
undulate

[1] #1 undulate v. [ripple, ruffle, riffle, cockle] stir up (water) so as to form ripples. wn

[2] #2 undulate s. having a wavy margin and rippled surface. wn

[3] #3 undulate v. [roll] occur in soft rounded shapes; "The hills rolled past". wn

[4] #4 undulate v. [roll, flap, wave] move in a wavy pattern or with a rising and falling motion; "The curtains undulated"; "the waves rolled towards the beach". wn

[5] #5 undulate v. increase and decrease in volume or pitch, as if in waves; "The singer's voice undulated". wn