The present participle of cran or cranny; the process of forming or making narrow cracks or crevices, or of hiding/storing things in such spaces.
From 'cranny' (noun) converted to verb form plus the '-ing' suffix to indicate ongoing action. Shows how nouns can be verbalized when the action becomes the focus.
Crannying describes what water does to stone over millennia—freezing in tiny cracks and expanding, slowly turning solid rock into something riddled with openings!
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