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English word odd duck comes from English duck, English odd
duck (English)
(US) A cairn used to mark a trail.. (cricket) A batsman's score of zero after getting out. (short for duck's egg, since the digit "0" is round like an egg.). (slang) A playing card with the rank of two.. (uncountable) The flesh of a duck used as food.. A building intentionally constructed in the shape of an everyday object to which it is related.. A marble to be shot at with another marble [...]
odd (English)
(not comparable) Casual, irregular, not planned.. (not comparable) Left over, remaining when the rest have been grouped.. (not comparable) Not divisible by two; not even.. (not comparable) Occasional; infrequent.. (not comparable) Single; sole; singular; not having a mate.. (not comparable, in combination with a number) About, approximately.. (obsolete) Singular in excellence; unique; sole; [...]
odd duck (English)
(idiomatic) An unusual person, especially an individual with an idiosyncratic personality or peculiar behavioral characteristics.