More on Flat-fish from Infoplease:

• Flat-fish - Flat-fish He is a regular flat-fish. A dull, stupid fellow, not up to anything. The play is upon ...
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• flatfish: meaning and definitions - flatfish: Definition and Pronunciation
• Lemon Soles - Lemon Soles which abound on the south coast of England and about Marseilles. Lemon is a corruption ...
• Flat - Flat One who is not sharp; a suite of rooms on one floor. “Oh, Messrs ... what flats you ...