tongued-and-grooved

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Definition of tongued-and-grooved in English English dictionary

tongue and groove
A joint, in flooring or panelling, made by fitting a ridge (tongue) along the edge of one board into a corresponding slot (groove) on another
tongue and groove
A joint made by fitting a tongue on the edge of a board into a matching groove on another board. tongue and groove boards fit together by pushing a piece that sticks out along the edge of one board into a hollow area along the edge of another board