Dictionary entry

Undulate (2)

Webster's Dictionary 1913

Un″du‐late (?), v. t. [imp. & p. p.Undulated (?); p. pr. & vb. n.Undulating.] 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.