Definition of square up phrasal verb from the Oxford Advanced American Dictionary

 

square up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    square up (to somebody/something)

     
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  1. 1to face a difficult situation and deal with it in a determined way
  2. 2to face someone as if you are going to fight them

square up (with somebody)

 
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to pay money that you owe Can I leave you to square up with the waiter?
See the Oxford Advanced Learner's Dictionary entry: square up