'BUTTON UP' Phrasal Verb

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Definition of Button up phrasal verb

Button up

1. Conclude an agreement
   (Separable [optional] | British English)
   
   » Example: They BUTTONED UP the deal.
2. Close or fasten with buttons
   (Separable [optional] | International English)
   
   » Example: She BUTTONED UP her coat and stepped outside into the cold.