## Etymology
From a- ('on, in a state of') + foul, from Old English ful ('rotten, unclean'), from Proto-Germanic *fulaz, from Proto-Indo-European *puH- ('to rot, stink').

## AI Etymology
afoul comes from a- ('on, in a state of') + foul, from Old English ful ('rotten, unclean'), from Proto-Germanic *fulaz, from Proto-Indo-European *puH- ('to rot, stink'). Morphologically, the word is transparent as a compound: its parts remain visible in the modern spelling, while the older history of those parts supplies the deeper ancestry. In modern use, the adjective sense is "in collision or entanglement, especially with rules or another party", which keeps the etymology connected to the word's present dictionary value rather than treating it as a merely historical label. The wider word family includes related English forms such as foul, befoul, showing how the same base continues to support neighboring English vocabulary. The principal historical forms in the chain include Old English ful, Proto-Indo-European *puH-, which anchor the explanation in named linguistic material.

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