<p><strong>Noun:</strong></p><ul><li>Also called plumb bob.</li><li>a piece of lead or some other weight attached to a line, used for determining perpendicularity, for sounding, etc.; the bob of a plumb line.</li><li>something that weighs down or depresses.</li></ul><p><strong>Verb:</strong></p><ul><li>to plunge.</li></ul><p><strong>Synonyms:</strong></p><ul><li>swoop, drop, dive, fall.</li></ul><p><strong>End of Response</strong></p>