tripping valve

A valve moved recurrently by the contact of some other part of the machinery. trip-ping-ly, *trip-ping-lie, adv. [Eng. trip ping: -ly.] In a tripping manner; with a light, nimble, and quick step; nimbly; with rapid but clear enunciation; fluently. "And this ditty, after me, Sing, and dance it trippingly ." Shakesp.: Midsummer Night's Dream, v. 2. †trip-pist, s. [Eng. trip , v.; -ist .] One who goes on a trip; an excursionist. ( Modern slang .) "With returning appetite came the desire to the convivial ocean trippists to set sail again for the Mediterranean." Modern Society , Jan. 16, 1886, p. 117.