crevasse

noun

1. A crack or fissure in a glacier or snowfield; a chasm.
2. (US)A breach in a canal or river bank.
3. (broadly)Any cleft or fissure.

   “I moved my left hand to the small of her back, just above her belt-line and stroked the peach fuzz in her crevasse with my fingers.”

4. (figuratively)A discontinuity or “gap” between the accounted variables and an observed outcome.

   “[…] he laments that he can find no physiological phenomenon answering to his subject’s winning a race, or losing it. Between his terminal output of energy and his victory or defeat there is a mysterious crevasse. Physiology is baffled.”

verb

1. (intransitive)To form crevasses.
2. (transitive)To fissure with crevasses.