CLACK (2)

clack (2). Clack, v.i. to make repeated noises

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Clack (?), v. t. 1. 1. To cause to make a sudden, sharp noise, or succession of noises; to click.
2. 2. To utter rapidly and inconsiderately. Feltham.
To clack wool, to cut off the sheep's mark, in order to make the wool weigh less and thus yield less duty.