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- DictionaryTongue and groove/ˌtəNG (ə)n ˈɡro͞ov/
noun
- 1. wooden planking in which adjacent boards are joined by means of interlocking ridges and grooves down their sides: "he'd built units in tongue and groove"
noun
Tongue and groove is a method of fitting similar objects together, edge to edge, used mainly with wood, in flooring, parquetry, panelling, and similar constructions. Tongue and groove joints allow two flat pieces to be joined strongly together to make a single flat surface. Before plywood became common, tongue and groove boards were also used for sheathing buildings and to construct concrete formw... Wikipedia