what one must do either because of one's job or because one thinks it right; moral obligation
"we must instill a sense of duty in our children"
"every right implies a responsibility; every opportunity, an obligation; every possession, a duty"
"the duties of the job"
"they signed a treaty to lower duties on trade between their countries"
Take that which is thy duty.
出自：Bible (Tyndale): Matthew
If A. be accountable to B. and B. releaseth him all his duties.
出自： E. Coke