What does "folding" mean?

Folding: (Agric.) The keepig of sheep in inclosures on arable land, etc. Folding boat, a portable boat made by stretching canvas, etc., over jointed framework, used in campaigning, and by tourists, etc. Ham. Nav. Encyc. Folding chairFolding door, one of two or more doors filling a single and hung upon hinges.

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