Englishfor English speakers
cleavage
Noun
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Cleavage is the gap between a woman's breasts.
Her low cut dress showed her cleavage.
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Cleavage is a when something is split into two parts.
There was a cleavage in the group between those who wanted to wait and those who wanted to leave.
propagation
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noun
the spreading of something (a belief or practice) into new regions
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noun
(= generation)
the act of producing offspring or multiplying by such production
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noun
the movement of a wave through a medium