noun
a debt that is based on personal integrity and honor rather than a legal obligation
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He considered it a debt of honour to repay the money he had borrowed from his friend.
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I feel like I owe him a debt of honour for all the times he has helped me out.
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I gotta pay back that debt of honour before he starts asking for it.
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In their culture, seeking revenge was seen as a debt of honour that had to be repaid.