do (one's) darnedest

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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.
References in periodicals archive ?
Wayne promised the others he'd do his darnedest to avoid any rough and tumble," explains our polite announcer.