Webster's English Dictionary

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undulate

Cross references:
  1. swing                 
 
1. un.du.late or un.du.lat.ed \-l*t, -.la-t\ \-.la-t-*d\ aj [L undulatus, 
   fr. (assumed) L undula, dim. of L unda wave -] more at WATER : having a 
   wavy surface, margin, or markings 
2. un.du.late \-.la-t\ vb [LL undula small wave, fr. (assumed) L] 1: to 
   form or move in waves : FLUCTUATE  2: to rise and fall in volume, pitch, or 
   cadence  3: to present a wavy appearance  : to move or cause to move in 
   wavy, sinuous, or flowing manner