## Etymology
From Middle English thwert ('across, crosswise'), borrowed from Old Norse thvert ('across'), neuter of thverr ('transverse'); the verb sense 'oppose, block' derives from going crosswise to a purpose.

## AI Etymology
Thwart is from Middle English thwert ('across, crosswise'), borrowed from Old Norse thvert ('across'), neuter of thverr ('transverse'); the verb sense 'oppose, block' derives from going crosswise to a purpose. Important recorded forms include thwert (Middle English) and thvert (Old Norse). The semantic development is already visible in the history: an older concrete or specialized use was extended into the modern meaning rather than replaced by a separate origin. In current use it covers to prevent someone from accomplishing something. The wider family includes derived forms such as thwarting and thwarted.

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