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Thwart means to confound, foil a plan beat someone or to run transversely across.
I must thwart the villain in his plans.
The seating ran thwart ships across the boat.
aid, assist, encourage are all antonyms for thwart
The word is thwart (prevent someone from doing something).
A thwart is a seat across a boat for a rower to sit on.
Eating a full meal at dinnertime will thwart evening hunger.