Sentence:  Brenda lifted the top off a shoebox and dug beneath the tissue paper, unearthing a two-toned, turquoise-and-cream, high-heeled pump. "This is one of my favorites," she said, balancing it in the palm of her hand. "I love shoes that show toe <WSD>cleavage</WSD>." / "Toe <WSD>cleavage</WSD>?" / Brenda kicked off a leather sandal, slipped her foot into the pump, and pointed to the baseline of her toes peeking through. "That's toe <WSD>cleavage</WSD>!" 
Meaning of the word marked with <WSD> tags:  Any similar separation between two body parts, such as the buttocks or toes.