do one's darnedest

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do one's darnedest (third-person singular simple present does one's darnedest, present participle doing one's darnedest, simple past did one's darnedest, past participle done one's darnedest)

1. (idiomatic, euphemistic) To do one's utmost; to make every effort or to try every possible approach or way.

   I don't think he'll succeed, but he's doing his darnedest to build a working spaceship.

• do one's damnedest