shudder (v.)

c. 1200, shoderen, "tremble, quake, shiver, vibrate,," not found in Old English; possibly from Middle Dutch schuderen "to shudder," or Middle Low German schoderen, both frequentative forms from Proto-Germanic *skuth- "to shake." Related: Shuddered; shuddering.

"act of shuddering, tremulous motion, vibration," especially a quick, involuntary quiver of the body, as from cold, fear, disgust; c. 1600, from shudder (v.).