Meaning
A difficult problem to solve or a person who is hard to understand, persuade or defeat. The expression suggests that the challenge resists ordinary efforts and may require persistence or ingenuity.
Origin
The literal image is a hard-shelled nut that resists being opened. English has long used cracking nuts as a metaphor for solving difficult problems; the figurative expression is based on this everyday experience.
Examples
This puzzle is a tough nut to crack, even for experienced players.
The new negotiator is a tough nut to crack.
Finding a solution without raising prices will be a tough nut to crack.
Frequently asked questions
What does 'A tough nut to crack' mean?
A difficult problem to solve or a person who is hard to understand, persuade or defeat. The expression suggests that the challenge resists ordinary efforts and may require persistence or ingenuity.