Tap′ping.
1. Screw threading a hole.2. (Founding.) The jarring of a pattern in its bed in the sand to give it clearance. With small castings this is done by sticking a skewer into the pattern and tapping it with the slicker or trowel; with larger castings more energetic means are employed, but in the same way. 3. Boring a hole in a pipe, cask, etc., to insert a plug, connect a branch-pipe, or introduce a faucet, as the case may be. 4. Boring maples for sugar-water, as it is called in the Western, or sap, in the Eastern States.
