Etymology
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whet (v.)

Old English hwettan "to whet, sharpen," figuratively "incite, encourage," from Proto-Germanic *hwatjan (source also of Old Norse hvetja "to sharpen, encourage," Middle Low German, Middle Dutch wetten, Old High German wezzan, German wetzen "to sharpen," Gothic ga-hvatjan "to sharpen, incite"), from PIE root *kwed- "to sharpen" (source also of Sanskrit codati "incites," literally "sharpens;" Old English hwæt "brave, bold," Old Saxon hwat "sharp").

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Definitions of whet

whet (v.)
make keen or more acute;
whet my appetite
Synonyms: quicken
whet (v.)
sharpen by rubbing, as on a whetstone;
From wordnet.princeton.edu