Accusing or pursuing the wrong person or thing.
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When you're barking up the wrong tree, your effort is going in the wrong direction — you've made a wrong assumption about who or what is responsible.
It often implies wasted time and effort.
"Jump to Conclusions"
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Make assumptions too quickly without enough evidence
"Chase a Red Herring"
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Follow a misleading clue that takes you away from the truth
"Barking up the Wrong Tree"
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Looking for an answer in the wrong place or from the wrong person