Definition of border on phrasal verb from the Oxford Advanced Learner's Dictionary

 

border on

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1to come very close to being something, especially a strong or unpleasant emotion or quality She felt an anxiety bordering on hysteria.
  2. 2to be next to something areas bordering on the Black Sea
See the Oxford Advanced American Dictionary entry: border on