Undulate /(?)/

Un·du·late

Undulate

a.
  1. Same as Undulated.

Undulate

v. t.

imp. & p. p. Undulated; p. pr. & vb. n. Undulating

  1. To cause to move backward and forward, or up and down, in undulations or waves; to cause to vibrate.
    Breath vocalized, that is, vibrated and undulated.
    — Holder.

Undulate

v. i.
  1. To move in, or have, undulations or waves; to vibrate; to wave; as, undulating air.