shudder

From Middle English schoderen, schuderen, possibly from Middle Dutch schudderen and/or Middle Low German schodderen, iterative forms of the verb at hand in Dutch schudden, Low German schüdden (both “to shake”), German schütten (“to pour”), from Proto-West Germanic *skuddjan, from Proto-Germanic *skudjaną, from Proto-Indo-European *skewdʰ-. From Low German are also borrowed German schaudern (“to shudder”), Danish skudre, Swedish skudda.

Alternatively, possibly from an unrecorded Old English *sċudrian, an iterative variant to Old English sċūdan (“to shudder, quake”), from Proto-West Germanic *skudrōn (“to shake, tremble”), from the same source as the Middle Dutch and Middle Low German terms above.