Wordnet 3.0
NOUN (1)
1. 
 a submachine gun operated by gas pressure; 
 used by the British in World War II; 
[syn: Bren, Bren gun]
WordNet (r) 3.0 (2006):
Bren gun
    n 1: a submachine gun operated by gas pressure; used by the
         British in World War II [syn: Bren, Bren gun]