The word casing has several distinct meanings depending on the context in which it appears across various trades and everyday language. In construction, architecture, and interior carpentry, casing refers to the decorative trim boards that frame doors and windows to cover gaps between drywall and window frames. In manufacturing, engineering, and the oil and gas industry, a casing is a heavy-duty protective metal pipe or outer sleeve inserted into a bored hole to reinforce structural integrity and prevent cave-ins. In butchery and culinary arts, casing denotes the natural or synthetic tubular skin used to stuff and hold sausage meat together during production. In informal or criminal slang, casing means closely watching, scouting, or surveying a location to gather intelligence, often in preparation for a robbery.
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