| Undulate 1. (v. t.) To cause to move up and down, in undulations or waves; to cause to vibrate. 2. (v. i.) To move in, or have, undulations or waves; to vibrate; to wave; as, undulating air. Thesaurus Entries alternate, bank, be here again, be poised, billow, brandish, break, circle, comb, come again, come and go, come around, come round, come round again, come up again, crab, crash, cycle, dash, dip, ebb and flow, feather, fishtail, flap, flaunt, float, flourish, flutter, fly, heave, intermit, lift, loop, oscillate, peak, plow, popple, porpoise, pull out, pull up, pulsate, pulse, push down, reappear, recur, reoccur, repeat, return, revolve, rise, rise and fall, roll, roll around, rotate, scend, send, shake, sideslip, skid, slidder, smash, snake, spin, spiral, stunt, surge, swell, swing, toss, turn, wag, wave, wheel, wheel around, wield, wigwag, yaw |