3. (Mach.) To enlarge or shape, as a hole, with a drift.

Drift, a. That causes drifting or that is drifted; movable by wind or currents; as, drift currents; drift ice; drift mud. Kane.

Drift anchor. See Sea anchor, and also Drag sail, under Drag, n. - - Drift epoch (Geol.), the glacial epoch. -- Drift net, a kind of fishing net. -- Drift sail. Same as Drag sail. See under Drag, n.

Drift"age (?), n. 1. Deviation from a ship's course due to leeway.