drag

v. 1. (of a ship) trail (an anchor) along the seabed, causing the ship to drift.

2. (of an anchor) fail to hold, causing a ship or boat to drift.

3. search the bottom of (a river, lake, or the sea) with grapnels or nets:

See the Introduction, Abbreviations and Pronunciation for further details.

The braking effect of friction, imparted by a fluid on bodies passing through it.