'deep cleavage' is correct and usable in written English.
It is typically used in a context to describe a person's clothing, specifically when a neckline is cut very low down the chest and exposes a lot of cleavage. For example, "She wore a deep cleavage revealing black dress to the party."
"Deep cleavage is a decided plus," he said.
She is a bottle blonde with deep cleavage and bears more than a passing resemblance to Mae West.
He is watching the large gold cross between the widow's breasts swine back and forth in her deep cleavage.
Over in the Valley, a deep cleavage of greenery and ancient trees, Derrick Carter's perfectly judged 2am house is elegantly lit by Tracey Emin-inspired neons.
Overheard of the year At Cannes, as men's heads turned when a beautiful French star sashayed into the opening night party, displaying deep cleavage, another (older, very established) French actress told her entourage: "Yes, but you know they're not real – nobody's are these days".
A product that seems as American as "Sex and the City" now flirts with newsstand shoppers on six of the seven continents and produces hundreds of millions of dollars in revenue for Hearst, suggesting that deep cleavage and thinner thighs have global legs.
Deep cleavages run across the political landscape.
But as he struggles to put a more contemporary veneer on his rule, he faces a society still suffering deep cleavages that reflect unresolved questions of identity.
Mr Obama leads by 53 to 30 among blacks but loses by 21 to 40 among whites.The row also reflects deep cleavages along race and gender lines among Democratic voters nationally.
Dr. Hoodbhoy said that President Pervez Musharraf's support of the American campaign against the Taliban had caused "deep cleavages" in the Pakistani military, scientific and government circles and there was a danger that the government could lose control of parts of the highly secretive nuclear program.
More lies behind this loosening of an older pattern than might first appear: across faith traditions today deep cleavages exist between traditionalists and progressives.
