#926.  Duty. —­ N. duty, what ought to be done, moral obligation,
accountableness[obs3], liability, onus, responsibility; bounden duty, imperative duty; call, call of duty; accountability.
     allegiance, fealty, tie engagement &c. (promise) 768; part; function,
calling &c. (business) 625.
     morality,, morals, decalogue; case of conscience; conscientiousness
&c. (probity) 939; conscience, inward monitor, still small voice within, sense of duty, tender conscience, superego; the hell within [P.  L.]. dueness &c. 924; propriety, fitness, seemliness, amenability, decorum, gr/to prepon/gr; the thing, the proper thing; the right thing to do, the proper thing to do.
     [Science of morals] ethics, ethology.; deontology[obs3],
aretology[obs3]; moral philosophy, ethical philosophy; casuistry, polity.
     observance, fulfillment, discharge, performance, acquittal,
satisfaction, redemption; good behavior. 
     V. be the duty of; be incumbent &c. adj. on, be responsible &c. adj.;
behoove, become, befit, beseem; belong to, pertain to; fall to one’s lot; devolve on; lie upon, lie on one’s head, lie at one’s door; rest with, rest on the shoulders of. take upon oneself &c. (promise) 768; be bound to, become bound to, be sponsor for, become sponsor for; incur a responsibility &c. n.; be under an obligation, stand under an obligation, lie under an obligation; have to answer for, owe to it oneself.
     impose a duty, &c. n.; enjoin, require, exact; bind, bind over; saddle
with, prescribe, assign, call upon, look to, oblige.
     enter upon a duty, perform a duty, observe a duty, fulfill a duty,
discharge a duty, adhere to a duty, acquit oneself of a duty, satisfy a duty, enter upon an obligation, perform an obligation, observe an obligation, fulfill an obligation, discharge an obligation, adhere to an obligation, acquit oneself of an obligation, satisfy an obligation; act one’s part, redeem one’s pledge, do justice to, be at one’s post; do duty; do one’s duty &c. (be virtuous) 944.
     be on one’s good behavior, mind one’s P’s and Q’s. 
     Adj. obligatory, binding; imperative, peremptory; stringent &c.
(severe) 739; behooving &c. v.; incumbent on, chargeable on; under obligation; obliged by, bound by, tied by; saddled with.
     due to, beholden to, bound to, indebted to; tied down; compromised &c.
(promised) 768; in duty bound.
     amenable, liable, accountable, responsible, answerable.
     right, meet &c. (due) 924; moral, ethical, casuistical, conscientious,
ethological. 
     Adv. with a safe conscience, as in duty, bound, on one’s own
responsibility, at one’s own risk, suo periculo[Lat]; in foro conscientiae[Lat]; quamdiu se bene gesserit[Lat]. 
     Phr. dura lex sed lex[Lat]; dulce et decorum est pro patria mori[Lat];
honos habet onus[Lat]; leve fit quod bene fertur onus [Lat][Ovid]; loyaute m’oblige[Fr]; “simple duty bath no place for fear” [Whittier]; “stern daughter of the voice of God” [Wordsworth]; “there is a higher law than the Constitution” [Wm. Seward].