<p><strong>Noun</strong></p><ul><li>any of various bivalve mollusks, especially certain edible species</li><li>Informal. a secretive or silent person</li><li>clamminess</li><li>Slang. a dollar or the sum of a dollar: I only made 60 clams a week</li></ul><p><strong>Verb</strong></p><ul><li>(used without object) to gather or dig clams</li></ul><p><strong>Verb Phrase</strong></p><ul><li>Slang. to refuse to talk or reply; refrain from talking or divulging information: The teacher asked who had thrown the eraser, but the class clammed up.</li></ul>