pay back (v.)

• alternate
• atone
• bandy
• change
• commute
• compensate
• cooperate
• counterchange
• cover
• exchange
• expiate
• indemnify
• interchange
• logroll
• pay
• permute
• quit
• reciprocate
• recompense
• recoup
• rectify
• redress
• refund
• reimburse
• repay
• requite
• respond
• retaliate
• return
• reward
• square
• swap
• switch
• trade
• transpose