do (one's) darnedest

do (one's) darnedest

To put forth the utmost amount of energy or effort toward some task or goal. A more polite version of "do one's damnedest." Money is a little tight at the moment, but I'll do my darnedest to be there for your wedding.
Farlex Dictionary of Idioms.
See also:
  • darndest
  • do (one's) darndest
  • do (one's) damnedest
  • do your damnedest
  • do/try your damnedest
  • damnedest
  • try (one's) damnedest
  • do/try your utmost
  • do (one's) utmost
  • give (something) (one's) all