a unit of mass equal to the mass that accelerates at 1 foot/sec/sec when acted upon by a force of 1 pound; approximately 14.5939 kilograms
"The engineer calculated the thrust requirements for the rocket engine using slugs as the standard unit of mass in their imperial system equations."
a counterfeit coin
"The detective arrested the thief for trying to pass off a fake silver dollar as a real slug during the market transaction."
an amount of an alcoholic drink (usually liquor) that is poured or gulped
"he took a slug of hard liquor"
any of various terrestrial gastropods having an elongated slimy body and no external shell
"The garden was overrun by slugs that had eaten half the lettuce before we could set up the traps."
Any of many terrestrial pulmonate gastropod mollusks, having no (or only a rudimentary) shell.
"He absorbed a solid slug to the jaw that sent him stumbling backward."
A hard blow, usually with the fist.
To drink quickly; to gulp; to down.
"He decided to slug the opponent in the jaw during the bar fight."
To hit very hard, usually with the fist.
The word "slug" originally meant a slow or lazy person in Middle English. It likely comes from an Old English or Old Norse root meaning smooth or slick, which evolved to describe someone sluggish.