noun
EXAMPLES FROM CORPUS
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A man with monogrammed shirts, a maid, a mansion, and all he wanted was to finger her belly button .
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His checked shirt was pulled out of his pants, and his belly button was showing.
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In the early 1960s and 1970s and in the mid 1990s shrunken tight clothing often exposed the belly button .
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The belly button was protruding and it looked ready to burst.
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The ruby in her belly button stayed put.