Foolish or silly behavior; playful nonsense or buffoonery.
From 'daff' (to act foolishly) + '-ery' suffix (behavior or practice), following English patterns like 'knavery' or 'trickery' to nominalize verbs of misbehavior.
Adding '-ery' to describe foolish behavior is classic English—we do it with knaves, rogues, and fools, creating whole categories of entertaining misbehavior!
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