Shudder

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Middle English (as a verb): from Middle Dutch schūderen, from a Germanic base meaning ‘shake’.

wiktionary

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From Middle English *shudderen, *schuderen (suggested by Middle English shuddering, schudering(“shaking, quivering, shuddering”)), from Middle Dutch schudderen and/or Middle Low German schodderen, [1] iterative forms of the verb at hand in Dutch schudden, Low German schüdden (both “to shake”), German schütten(“to pour”), from Proto-Germanic *skudjaną, from Proto-Indo-European *skewdʰ-. From Low German are also borrowed German schaudern(“to shudder”), Danish skudre.

etymonline

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shudder (v.)

early 14c., possibly from Middle Dutch schuderen "to shudder," or Middle Low German schoderen, both frequentative forms from Proto-Germanic *skuth- "to shake." Related: Shuddered; shuddering.

shudder (n.)

c. 1600, from shudder (v.).