Definition of the Battle of the Bulge from the Oxford Advanced Learner's Dictionary

 

the Battle of the Bulge

 
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a strong but unsuccessful attack by German forces against the Allies in southern Belgium in 1944. The word bulge means a swelling, so the phrase is also used in a humorous way to mean a struggle to lose weight, e.g. by going on a diet I'm fighting the battle of the bulge.