The action of reaching the highest point or peak of something; also, ornamental molding or trim placed on top of a roof or wall.
From crest (the peak) plus -ing (forming gerunds and present participles), or referring to the decorative crest elements in architecture.
In architecture, roofline cresting used to be super fancy—medieval castles and Victorian buildings showed off their wealth with ornate metal cresting that caught the light and framed the skyline!
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