grasp at straws
Definition from Wiktionary, the free dictionary
This idiom refers to a drowning man grabbing any floating object, even a straw, to save himself. It was first used by Thomas More in Dialogue of Comfort Against Tribulation (1534).
- (idiomatic) To guess randomly at or pursue any apparent option, due to a lack of clear choices or information.
- I've never met his mother, so I'm grasping at straws for an appropriate gift for her.
- Titelman, Gregory Y., "The Random House Dictionary of Popular Proverbs and Sayings" (Random House, New York, 1996).