Meaning of “I don't know how, what, why, etc.” in the English Dictionary

british dictionary

"I don't know how, what, why, etc." in British English

See all translations

I don't know how, what, why, etc.

informal

used to add force to criticisms, expressions of surprise, etc.:

I don't know how you can eat that revolting stuff!
I don't know why you bother.

(Definition of “I don't know how, what, why, etc.” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)