jounce

Of unknown origin, possibly a Portmanteau / Blend of jolt +‎ bounce.

• Rhymes: -aʊns

jounce (third-person singular simple present jounces, present participle jouncing, simple past and past participle jounced)

1. (transitive, intransitive) To jolt; to shake, especially by rough riding or by driving over obstructions.
   • 1931, William Faulkner, Sanctuary, Library of America, 1985, p.51:

     She felt herself swooping, then she was lying on the bed beside Gowan, on her back, jouncing to the dying chatter of the shucks.

• jouncy

jounce (countable and uncountable, plural jounces)

1. (physics) The fourth derivative of the position vector with respect to time; the time derivative of jerk.