Past tense of drool; let saliva flow from the mouth, or expressed excessive enthusiasm about something.
From Old Norse 'drúla' (to drip), combined with the '-ed' past tense marker. The word entered Middle English through Scandinavian influence and has referred both to literal saliva and figurative excessive desire.
The fact that 'drool' comes from Old Norse tells us that Scandinavian languages were really good at describing subtle behaviors—they even had special words for how your mouth drips when you're really excited!
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