1. (

• ripple ,
• ruffle ,
• riffle ,
• cockle ,
• undulate ,

) stir up (water) so as to form ripples ;

2. (

• roll ,
• undulate

) occur in soft rounded shapes; "The hills rolled past" ;

3. (

• roll ,
• undulate ,
• flap ,
• wave

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

4. (

• undulate

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

1. (

• undulate

) having a wavy margin and rippled surface ;