Definition of cleavage noun from the Oxford Advanced Learner's Dictionary

     

    cleavage

     noun
    noun
    BrE BrE//ˈkliːvɪdʒ//
     
    ; NAmE NAmE//ˈkliːvɪdʒ//
     
     
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  1. 1[countable, uncountable] the space between a woman’s breasts that can be seen above a dress that does not completely cover them She leaned forward slightly, revealing a deep cleavage.
  2. 2[countable] (formal) a difference or division between people or groups a deep cleavage between rich and poor in society
  3. Extra examples She leaned forward slightly, revealing a deep cleavage.
See the Oxford Advanced American Dictionary entry: cleavage