a·thwart (?-thwôrt?)prep.1. From one side to the other of; across: “the Stars that shoot athwart the Night” (Alexander Pope).2. Contrary to; against.3. Nautical Across the course, line, or length of.adv.1. From side to side; crosswise or transversely.2. So as to thwart, obstruct, or oppose; perversely.[Middle English : a-, on; see a-2 + thwert, across; see thwart.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.athwart (???w??t) advtransversely; from one side to anotherprep1. across the path or line of (esp a ship)2. in opposition to; against[C15: from a-2 + thwart]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014a?thwart (???w?rt) adv. 1. from side to side; crosswise. 2. perversely; awry; wrongly. prep. 3. from side to side of; across. 4. in opposition to; contrary to. [1425?75] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.athwartAcross the width of a boat.Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited