undulating

verb (used without object), un·du·lat·ed, un·du·lat·ing.

1. to move with a sinuous or wavelike motion; display a smooth rising-and-falling or side-to-side alternation of movement: The flag undulates in the breeze.
2. to have a wavy form or surface; bend with successive curves in alternate directions.
3. (of a sound) to rise and fall in pitch: the wail of a siren undulating in the distance.

verb (used with object), un·du·lat·ed, un·du·lat·ing.

4. to cause to move in waves.
5. to give a wavy form to.

adjective

6. Also un·du·lat·ed. having a wavelike or rippled form, surface, edge, etc.; wavy.

verb

1. to move or cause to move in waves or as if in waves
2. to have or provide with a wavy form or appearance

adjective (ˈʌndjʊlɪt, -ˌleɪt) undulated

3. having a wavy or rippled appearance, margin, or forman undulate leaf

v.1660s, from undulation. Related: undulated, undulating.