Manx Alternative forms yeeast Etymology From Old Irish íasc. Cognate with Irish iasc. Pronunciation IPA(key): /jiːst/, [jiːs] Noun eeast m (genitive singular eeast, plural eeastyn) fish Bioys da dooinney as baase da eeast.Life to man and death to fish. She dooghys eeast eh dy snaue.The nature of fish is to swim. Ta'n awin plooghit lesh eeast.The river is teeming with fish. Ta'n eeast shoh snaue er eaghtyr ny marrey.These fish swim on the top of the sea. Wikiwand - on Seamless Wikipedia browsing. On steroids.