411 REFERENCE · Wiktionary
Chicago piano
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Noun
en slang weapons The Thompson submachine gun.
en slang military weapons A 1.1-inch anti-aircraft gun.
en slang military weapons A multiple 2-pounder gun pom pom anti-aircraft gun.
Further reading
en Firearms