Definition of head off phrasal verb from the Oxford Advanced American Dictionary

 

head off

 phrasal verb
phrasal verb
 
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Phrasal Verbs

head somebodyoff

 
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to get in front of someone in order to make them turn back or change direction synonym intercept We'll head them off at the bridge!

head somethingoff

 
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to take action in order to prevent something from happening He headed off efforts to replace him as leader.
See the Oxford Advanced Learner's Dictionary entry: head off