ˌtongue and ˈgroove BrE AmE adjective
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:
tongue and groove floorboards
ˌtongue and ˈgroove BrE AmE adjective
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:
tongue and groove floorboards
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012