Гугл пока выдает следующие значения слова cleavage: расщепление, раскол, слоистость, не согласие или разделение мнений. Что по сути верно, а если ваш контекст предполагает совсем иное?

Cleavage — декольте, или глубокий вырез женской одежды.

Определение кембриджского словаря:

The narrow space between a woman’s breasts, that is seen when she wears a piece of clothing that does not cover the top of them.

Примеры:

Clare was wearing a low-cut dress that showed off her cleavage.

She has nice cleavage.

Women seem to be showing off their cleavage more than ever before.

I recorded a video of her clveage to see later.

How much cleavage is good cleavage?

Don’t look at my cleavage!

I am not responsible, if you focus on my cleavage.