(chiefly, North America) Lumber that is finished (milled or planed) and cut to standardized width and depth; in some countries the nominal sizes differ from the actual sizes in well-established ways (for example, in the United States, a two by four is nominally 2 inches by 4 inches and is actually 1½ by 3½ inches).
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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