two-by-fournoun [ C or U ]
uk/ˌtuː.baɪˈfɔːr/us/ˌtuː.baɪˈfɔːr/a standard size of finished wood used for building that measures slightly less than two inches wide and four inches deep and can be cut to various lengths, or wood of this size:
You'll need four eight-foot two-by-fours to frame out that wall.
a two-by-four board
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Building materials
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