The action or process of making creases or folds; also can refer to creases collectively or the pattern of wrinkles on a surface.
Present participle of 'crease' formed with the suffix '-ing'. The gerund form allows 'creasing' to function as a noun describing both the action and the result of folding.
In origami, 'creasing' is an art form—the quality of your creases determines whether your paper fold looks amateur or professional, and experienced folders can feel where the paper wants to crease.
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