- a plug or stopper placed in the muzzle of a piece of ordnance when not in use, to keep out dampness and dust.
- a plug placed in a gun’s muzzle when the gun is not in use to keep out moisture and dust
n.early 15c., “plug, bung,” from Middle French tampon, nasalized variant of Old French tapon “piece of cloth to stop a hole” (late 14c.), a suffixed form of Frankish *tappo “stopper, plug,” related to Old High German zapfo and Old English tæppa “stopper” (see tap (2)). Meaning “wooden plug for the muzzle of a gun” (to keep out rain or seawater) is recorded from 1620s.