The quality possessed by many crystallized substances of splitting readily in one or more definite directions, in which the cohesive attraction is a minimum, affording more or less smooth surfaces; the direction of the dividing plane; a fragment obtained by cleaving, as of a diamond. See Parting.
Division into laminae, like slate, with the lamination not necessarily parallel to the plane of deposition; -- usually produced by pressure.
I'm not somebody who likes to show off my cleavage, and I don't dress up for the papers. Louise Nurding
I like the collarbone, a very clean collarbone. I think there's something also very delicate and balletic about that part of a woman's body, and I'm not really a cleavage person, but I do like a back or a shoulder; I think there's something very alluring about backless dresses. Gugu Mbatha-Raw
I love deep cleavage on the foot. It reminds me of Berlin in 1930s, 'Cabaret.' Christian Louboutin