We found one dictionary that defines the word fish rots from the head:

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1. the fish rots from the head: Wiktionary

▸ Words similar to fish rots from the head ▸ Usage examples for fish rots from the head ▸ Idioms related to fish rots from the head ▸ Wikipedia articles (New!) ▸ Words that often appear near fish rots from the head ▸ Rhymes of fish rots from the head ▸ Invented words related to fish rots from the head