Meaning of “be pissing in the wind” in the English Dictionary

English

"be pissing in the wind" in English

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be pissing in the wind

to be trying to do something when there is no hope of succeeding:

You can try to change her mind if you like, but you'll be pissing in the wind.

(Definition of “be pissing in the wind” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)