The debt of a country or subdivision, when large enough that servicing it has become difficult.

The cumulative effect of not getting enough sleep, especially as seen as able to be made up for by sleeping more than usual.

(business, accounting) A debt which cannot be recovered from the debtor, either because the debtor lacks the money to pay or because the debtor cannot be found and/or forced to pay.

(finance) The debt held by governments, households, and companies not in the financial sector.

(economics) Any money owed by the government of a nation.

the overuse, by an individual or state, of the carbon dioxide absorption capacity of the world's oceans, vegetation and soil

the amount of extra oxygen required to oxidize lactic acid in the muscles built up during vigorous exercise

Very grateful for something (a favor) that someone has done for one.

(euphemistic) Death, seen as an obligation that all living creatures must eventually "pay".

(software engineering) The implied cost of additional future work caused by choosing an easy but inferior solution originally.