do one’s thing

section s-s s-s

do one’s best

do one’s bit

do one’s damnedest

do one’s devoir

do one’s duty

do one’s endeavor

do one’s hair

do one’s level best

do one’s need

do one’s part

do one’s possible

do one’s utmost

do one's best

do one's duty as a younger brother

do one's level best

do one's nut

do one's utmost

failure to do one’s duty