Bites or chews something vigorously and noisily, or shows eagerness by biting at something.
Origin uncertain, possibly a variant of 'champ' (to bite or grind teeth), itself possibly onomatopoetic or from Old English 'camb' (comb). The word emerged in American English in the 19th century.
The phrase 'chomping at the bit' comes from horses that eagerly bite their bridles while waiting to run—metaphorically, it means someone is extremely eager and impatient to do something.
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