negation - Understanding the purported ambiguity in “Every boy didn’t run”


I am a com­puter sci­ence pro­fes­sional. I am read­ing the book Nat­u­ral Lan­guage Un­der­stand­ing by James Allen where he writes:



“Every boy didn’t run” which is am­bigu­ous be­tween the read­ing in which some boys didn’t run and some did and no boys ran.



As I am not a na­tive English-lan­guage speaker, I couldn’t un­der­stand the am­bi­gu­ity here. Please ex­plain how the mean­ing can ever be some boys didn’t run and some did here.




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