jounce

Etymology

Unknown, possibly a Portmanteau / Blend of jolt + bounce.

verb

1. (transitive, intransitive) To jolt; to shake, especially by rough riding or by driving over obstructions.
   Send these nice, white, clean shipping cases of honey to a commission man, without any instruction whatever, and he will have the genius and liberality to slap them upon a dray, jounce them to his store, rub them around and over an old, dirty floor, sell a part of it for less than you expected, fail to pay for it until he sells the other part, which he will do after six months or a year, then he will remit, provided the debt has not yet got so old that it is outlawed or he does not "bust up" in business in the mean time. 1890, The Bee Keepers' Review
   So now, stimulated by some further experience with that world which does not care a tinker's damn whether a verb agrees with its subject in number and person or not, she permitted the taxicab to jounce her smile out of all semblance to anything calmly superior and into a very unschoolmarmish grin. 1921, Harvey Wickham, “Introducing the Garden of Eden”, in The Clue of the Primrose Petal, New York, N.Y.: Edward J. Clode, page 9
   She felt herself swooping, then she was lying on the bed beside Gowan, on her back, jouncing to the dying chatter of the shucks. 1931, William Faulkner, Sanctuary, Library of America, published 1985, page 51
   The bed jounced when Mannie sat down on it where the medic had been sitting. 1971, Ursula K. Le Guin, The Lathe of America

noun

1. A movement, such as a jolt or a shake.
   1966, Kathryn R. Schoonmaker vs. The State of New York, Claim No. 41795, State of New York Supreme Court, Appellate Division, Third Department Well, I remember we were bouncing around, the car was tilting back and forth, and it seems like it was bouncing after we made this big jounce and went up over the driveway, it was bouncing and tilting back and forth.
   When the drive axles have inner and outer joints, rear wheel camber change is minimized during wheel jounce and rebound. 2010, Don Knowles, Today's Technician: Automotive Suspension & Steering
2. (physics) The fourth derivative of the position vector with respect to time; the time derivative of jerk.