Jaws, lips, mouth.
[…]who knows but ſome fine lady of St. James's pariſh might admit into her delicate mouth thoſe very cherries, which had been rolled and moiſtened between the filthy, and, perhaps, ulcerated chops of a St. Giles's huckſter[…]
One's skill at musical interpretation and delivery; musical performance ability.
Although the bass player had no experience playing in New Orleans, the crowd's enthusiastic response showed that he had the chops to make it in the very particular Crescent City jazz scene.
From the plural of chop (“jaw, side of a harbour”). The jazz slang sense “musical ability” is a reference to the use of the lips to blow instruments.
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