Meaning of SLUG in English
1》 a tough-skinned terrestrial mollusc which lacks a shell and secretes a film of mucus for protection. [Order Stylommatophora.]
2》 an amount of an alcoholic drink that is gulped or poured.
3》 an elongated, typically rounded piece of metal.
↘ chiefly N. Amer. a bullet.
4》 a line of type in Linotype printing.
■ verb ( ~s , ~ging , ~ged ) gulp (something, typically alcohol).
ME (in the sense '~gard'): prob. of Scand. origin.
~ 2 informal,
chiefly N. Amer.
■ verb ( ~s , ~ging , ~ged ) strike with a hard blow.
↘( ~ it out ) settle a dispute or contest by fighting or competing fiercely.
■ noun a hard blow.
C19: of unknown origin; cf. slog .
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004