Grease Gun Definition

noun
A hand-powered pump used to force grease under pressure into bearings.
American Heritage
A submachine gun.
American Heritage

A levered device for forcing grease into machinery.

Wiktionary

(colloquial, due to its appearance) A small machine gun, particularly the .45 calibre M3 used by the US in WW2.

Wiktionary
Synonyms:

Other Word Forms of Grease Gun

Noun

Singular:
grease gun
Plural:
grease-guns

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grease gun