Clappy-doo - definition of clappy-doo by The Free Dictionary
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clappy-doo (ˌklæpɪˈduː) or
(Animals) Scot a large black mussel
[C19: probably from Scottish Gaelic clab enormous mouth + dubh black]
References in periodicals archive
What is a clappy-doo
? the 15th century by Guru Nanak?