<p><strong>Noun</strong></p><ul><li>Informal: A word that is hard to pronounce; real jawbreakers like "antidisestablishmentarianism" or "antiangiogenic."</li><li>A very hard, usually round candy; also called jaw crusher.</li><li>Mining: A machine used to break up ore, consisting of a fixed plate and a hinged jaw moved by a toggle joint.</li></ul>