Cleavage

What is Cleavage ?

Cleavage is (noun) 1. the space between the breasts, especially if it can be seen with a low-cut dress All the ladies were dressed in black and there was not a cleavage in sight. 2. a split, or difference of opinion The cleavage between the two groups became more and more apparent.

 

source: Easier English, Student Dictionary Upper Intermediate Level