Pronounced: HAYD-l, adj
Notes: Another new word for me
The word judder, as a verb, means “to shake or vibrate violently”. As a noun it means “an intense shaking or vibration”
This word came into English in the 1920s.
Background / Comments
You may have correctly guessed that this is another blended word — this time it is jerk/jolt/jar combined with shudder. Nevertheless, I don’t recall reading or hearing this word.