repay

verb4

1. •
   To give in return; requite.
2. •
   to return borrowed money to its owner

   • I finally repaid my student loans, just before sending my kids to college.
   • I'll repay this wrong asap.
3. •
   To make worthwhile; to yield a result worth the effort; to pay off.

   • The possible importance of excessive androgen secretion and the ingestion of agents such as the fluorenamines may repay further investigation. — 2013
4. •
   To pay (cover with tar, pitch, etc.) again.