dividing, splitting, separating; see break 1, division 1, fracture 1.
split, cleft, rift; see hole 1, 2.
"cleavage." YourDictionary, n.d. Web. 23 June 2018. <http://thesaurus.yourdictionary.com/cleavage>.
cleavage. (n.d.). Retrieved June 23rd, 2018, from http://thesaurus.yourdictionary.com/cleavage
A usually narrow partial opening caused by splitting and rupture:
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