one's teeth water en · X
Meanings
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(dated) One salivates or is visibly hungry or (figurative) eager for something.
Now his teeth watered as he saw the mad-looking woman apparently gulp down that which, from the fragrance it emitted, could be nothing less than the most potent kind of the beverage he loved.
1828, Michael Banim, The Croppy, volume 2, page 216: