Neptune's cup
/ˈnɛptjuːnz kʌp/ /ˈnɛptʃuːnz kʌp/noun
A marine leuconoid sponge of the genus Poterion, which forms a very large, goblet-shaped structure.
Origin
Mid 19th century; earliest use found in Robert Edmond Grant (1793–1874), comparative anatomist and transmutationist. From the genitive of Neptune + cup.
- the chattering classes
- the cherry on the cake (or on top)
- the Cheviots
- the Chilterns
- the chop
- the Church Establishment
- the Cid
- the City
- the Coast
- the coast is clear
- thecodont
- the cold shoulder
- the Cold War
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- the Common Market
- the Commons
- the common touch
- the common weal
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- the Continent