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 classic literature ?
But this is my deal, and it's up to me to do my darndest.
i'm going to do my darndest to make Stella one of the great Corrie characdull, J ters.
I'm very appreciative of what the voters did for me this week, and I'm going to do my darndest to earn their confidence.