Big Bertha
noun Informal.
a large, long-range German cannon used during World War I.
British Dictionary definitions for big bertha
Big Bertha
noun
any of three large German guns of World War I used to bombard Paris
Word Origin for Big Bertha
C20: approximate translation of German
dicke Bertha : fat Bertha; named after
Bertha Krupp, at whose works in Essen a very effective 42 cm mortar was made