devoir
/dəˈvwɑː(r)/noun
1- archaic a person's duty〈古〉义务, 责任, 职责：
you have done your devoir right well.
你已经很好地尽责了。
1.1
pay one's devoirs
pay one's respects formally致敬, 尊敬。
词源
Middle English: from Old French deveir, from Latin debere 'owe'. The spelling， and subsequently the pronunciation， was changed under the influence of modern French devoir.