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tr.v. thwart·ed, thwart·ing, thwarts
1. To prevent the occurrence, realization, or attainment of: They thwarted her plans.
2. To oppose and defeat the efforts, plans, or ambitions of (someone).
1. A seat across a boat on which a rower may sit.
2. A transverse strut in a canoe or other small boat.
1. Extending, lying, or passing across; transverse.
2. Eager to oppose, especially wrongly; perverse.
adv. & prep. Archaic
[Middle English thwerten, from thwert, across, from Old Norse thvert, neuter of thverr, transverse; see terkw- in Indo-European roots.]
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.
archaic sideways or crosswise
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014