To be in a state of fear, shock, amazement, etc., such as might cause one to tremble.
Origin
From Middle English quaken, from Old English cwacian, from Proto-Germanic *kwakōną, from Proto-Indo-European *gʷog-, related to Old English cweċċan (see quitch), Dutch kwakkelen, German Quackelei, Danish kvakle, Latin vēxō, Irish bogadh.
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