be incumbent etc.adj.. on, be responsible etc.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 etc.(promise)Promise
be bound to, become bound to, be sponsor for, become sponsor for
incur a responsibility etc. 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 etc.(be virtuous)Virtue. be on one's good behavior, mind one's P's and Q's.