Please, I´m translating a book and I got across this expression that I never heard of. Could anyone help me plese? I really need this job!!!
The "tongue" refers to a piece that sticks out from the main body of an object; it fits into a "groove" or a slot that is carved into another object.
Here is an example of a piece with a tongue. The small edge closest to the hammer is the tongue. The tongue on the other end of the piece is already inserted into the groove.