<p><strong>Verb (used without object)</strong></p><ul><li>to make a quick, sharp sound, or a succession of such sounds, as by striking or cracking.</li><li>to talk rapidly and continually or with sharpness and abruptness; chatter.</li><li>to cluck or cackle.</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>to utter by clacking.</li><li>to cause to clack: He clacked the cup against the saucer.</li></ul><p><strong>Noun</strong></p><ul><li>a clacking sound.</li><li>something that clacks, as a rattle.</li><li>rapid, continual talk; chatter.</li></ul>