0 money that someone owes that they cannot be forced by law to pay back, but that they have a moral duty to pay back:
I'm furious that a debt of honour should have to be pursued through the courts like this.
He said the tax-free payment would repay a "debt of honour" owed by the country to members of the armed forces.
I was offered a better-paid job, but feel I have a debt of honour to my boss.
Brought up in Quebec, he was able to repay to French-speaking Canada a debt of honour by creating in Montreal a company of young actors drawn from both the English- and French-speaking communities.
