Tongue-and-groove joint - definition of tongue-and-groove joint by The Free Dictionary
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1. (Building) a joint made between two boards by means of a tongue along the edge of one board that fits into a groove along the edge of the other board
a joint between two boards in which a raised area on the edge of one board fits into a corresponding groove in the edge of the other.
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(2) Prepare the tongue-and-groove joint
using either a dado set and table saw or a router with a Vi-inch router bit to create a 1/2-by-1/2-inch tongue along one side of two of the long boards and two of the short boards.
Original designs required all these edge joints to be glued together, but most modern laminates click together with a self-locking, glueless tongue-and-groove joint
Be careful not to damage the tongue-and-groove joints
when doing this.