Full of fish; abundant in fish or containing many fish.
Compound of 'fish' (Old English 'fisc') and the suffix '-ful' (Old English '-full', meaning full or abundant). This formation follows the regular English pattern of adding '-ful' to create adjectives meaning 'full of' or 'containing.'
The suffix '-ful' is one of English's most productive affixes, creating 'successful,' 'beautiful,' and 'fishful' — but interestingly, 'fishful' is rare because most people say 'teeming with fish' or 'well-stocked' instead, showing how word formation isn't just about rules but about what speakers feel sounds right.
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