To prevent someone from accomplishing something; to oppose or obstruct a plan or effort. Can also mean a crosswise seat in a boat.
From Old Norse 'þvert' meaning 'across, crosswise,' related to 'þverr' meaning 'transverse.' Originally used as an adverb meaning 'crosswise,' it evolved into a verb by the 16th century with the sense of going against or opposing something. The nautical meaning (crosswise seat) preserves the original directional sense.
The word 'thwart' beautifully captures its meaning through its etymology - just as a crossbeam blocks forward movement, to thwart someone means to cut across their path to success. Pirates and adventure stories love this word because it sounds both nautical and dramatic, perfect for describing how heroes' plans are constantly being blocked by villains!
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