American English

Definition of turtle noun from the Oxford Advanced American Dictionary



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  1. 1(also sea turtle) a large reptile with a hard round shell, that lives in the ocean
  2. 2(informal) any reptile with a large shell, for example a tortoise or terrapin
  3. Idioms
    turn turtle
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    (of a boat) to turn over completely while sailing
See the Oxford Advanced Learner's Dictionary entry: turtle