Definition of border on phrasal verb from the Oxford Advanced American Dictionary

 

border on

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    border on something

     
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  1. 1to come very close to being something, especially a strong or unpleasant emotion or quality She felt an anxiety bordering on hysteria.
  2. 2 to be next to something areas bordering on the Pacific
See the Oxford Advanced Learner's Dictionary entry: border on