<p><strong>Adverb</strong></p><ul><li>from side to side; crosswise</li><li>Nautical: at right angles to the fore-and-aft line; across</li><li>broadside to the wind because of equal and opposite pressures of wind and tide: a ship riding athwart</li><li>perversely; awry; wrongly</li></ul><p><strong>Preposition</strong></p><ul><li>across</li><li>across the direction or course of</li><li>in opposition to; contrary to</li></ul>