undulate

Adjective

• having a wavy margin and rippled surface

Verb

• increase and decrease in volume or pitch, as if in waves
  • The singer's voice undulated
    

• move in a wavy pattern or with a rising and falling motion
  • The curtains undulated
    
  • the waves rolled towards the beach
    

• occur in soft rounded shapes
  • The hills rolled past
    

• stir up (water) so as to form ripples

Related words

• Synonyms: 
  roll , flap , wave , ripple , ruffle , riffle , cockle