Definition of horn in phrasal verb from the Oxford Advanced Learner's Dictionary

 

horn in

 phrasal verb
phrasal verb
 
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Phrasal Verbs

horn in

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horn in on somebody

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horn in on something

 
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(North American English, informal) to involve yourself in a situation that does not concern you I'm sure she doesn't want us horning in on her business.
See the Oxford Advanced American Dictionary entry: horn in