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The depression created between a woman's breasts via partial exposure of the chest.
In anime, video games, and art, the cleavage is a popular method of adding some sexual appeal to the character. It should be noted that the cleavage is sometimes shown on characters as merely a curved line, while other times it has an extra, smaller line on the end, making the shape of a "Y" at the top of the depression.
Please note that this tag implicates breasts.
See also
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