Dic: service a debt

COBUILD | 18 [VERB] V n
If a country or organization services its debts, it pays the interest on them: ex) Almost a quarter of the country's export earnings go to service a foreign debt of $29 billion.

OALD | 3. service something. (technical) to pay interest on money that has been borrowed: ex) The company can no longer service its debts.

COLLINS | 27) Brit. to meet interest and capital payments on (debt)

LDOCE | 3. service a debt/loan: technical. to pay the interest on a debt

American Heritage | 3. To make interest payments on (a debt).

McMillian | 3 BUSINESS. to pay interest on money that you have borrowed from someone: ex) service a debt