adverb
from side to side; across
preposition
from one side to the other side of
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The ship's mast lay athwart the deck, obstructing the crew's movements.
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I had to climb athwart the fallen tree to reach the other side of the trail.
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I can't believe he tried to jump athwart that fence, he's crazy!
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Her decision to drop out of college cut athwart her parents' expectations for her future.