buy back

verb2

1. •
   To purchase (something already sold, misplaced, destroyed, or given away).

   • Investors have already started buying back shares they had sold last year in an effort to increase their profits.
2. •
   To be used to purchase (something already sold, misplaced, destroyed, or given away).

   • The profits from the new software version bought back the division that'd earlier been sold off by the company.