To make something resemble fish, taste like fish, or become suspicious or fishy in nature.
From 'fish' + '-ify' (Latin 'facere,' to make), a productive suffix that can attach to virtually any noun to create a verb meaning 'to make or become (that thing).'
The '-ify' suffix is so powerful in English that even though 'fishify' is rare, any speaker immediately understands it means 'to make fishy'—this is the same productivity that lets us say a company can 'vertically integrate' or a scientist can 'hypothesize,' all using the same word-building rule.
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