heel cut

seat cut

seat cut
A horizontal cut at the lower end of a rafter so that it may rest securely on the edge of a horizontal timber such as a wall plate; also see illustration for bird’s mouth.
References in periodicals archive ?
5 with a heel pin, the sides and heel cut down, and a longer vamp.
If the heel of a man's sock wore out then his wife could replace it by sewing on the shape of the heel cut from the top of the sock.
The in-form midfielder has been struggling with a bruised heel all week and has been unable to train - but the Blues' medical staff will ask the player to try and join in wearing a boot with the heel cut out