An archaic or dialectal term for a prank, trick, or deceptive action; also a variant spelling of 'gliss' (a musical glissando).
From Middle English and Old English origins, possibly connected to Proto-Germanic roots meaning 'to slip' or 'to slide,' suggesting the idea of something deceptive or smoothly executed.
The slippery etymology of 'glis' mirrors its slippery meaning—it seems to slide between different contexts (trickery, music, physical motion), making it a perfect example of how single words can fragment into multiple specialized meanings over centuries.
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