do one's damnedest

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

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

   I think he'll do his damnedest to become CEO one day.

• do one's darnedest