a character in a nursery rhyme (=old song or poem for young children). She is a young girl who loses the sheep that she is supposed to be taking care of. The rhyme goes: Little Bo Peep has lost her sheep/And doesn't know where to find them;/Leave them alone, and they'll come home,/Bringing their tails behind them.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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