jounce

[jouns]
verb (used with object), verb (used without object), jounced, jouncing.
1.
to move joltingly or roughly up and down; bounce.
noun
2.
a jouncing movement.

Origin:
1400–50; late Middle English; apparently blend of joll to bump (now obsolete) and bounce

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World English Dictionary
jounce (dʒaʊns)
 
vb
1.  to shake or jolt or cause to shake or jolt; bounce
 
n
2.  a jolting movement; shake; bump
 
[C15: probably a blend of dialect joll to bump + bounce]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

jounce
c.1440, of unknown origin, perhaps a blend of jump and bounce.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Remove the jounce bumper bolts and bumpers, and if necessary, the spring lower insulators.
These motor homes lack the required jounce clearance between the rear wheels.
At night when it's quiet and no one's around, bed bouncers jounce above everyone's head.
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