Past tense of shake; moved something back and forth rapidly, or trembled.
From Old English 'sceacan,' from Proto-Germanic roots. The past tense form 'shook' is irregular, preserved from ancient English conjugation patterns.
English has about 200 irregular verbs like 'shake-shook-shaken,' and most are among the most common words we use—these survived because we use them so frequently that they didn't get 'regularized' like newer verbs.
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