<p><strong>Noun</strong></p><ul><li>a thrust in an upward direction</li><li>a sudden and forceful upward movement, as of a nation's economy or the stock market: Market observers are hoping the upthrust can be sustained</li><li>Geology: an upheaval</li></ul><p><strong>Verb</strong></p><ul><li>to thrust upward: Frost caused the ground to upthrust</li></ul>