IdiomAnimalsItalian

essere un osso duro

Meaning: Be a difficult, stubborn person who is challenging to deal with or influence.

Literally: To be a hard bone

Example: “Il difensore avversario è un osso duro.” — The opposing defender is a hard nut to crack.

English equivalent: A hard nut to crack

Origin: Osso traces to Latin os, ossis, bone, and the metaphor is direct and needs little unpacking: a genuinely hard, dense bone resists being broken or worked through, the same stubborn resistance a difficult opponent or an unyielding problem presents to anyone trying to overcome it. The image likely has roots in hunting and butchering traditions, where the hardest bones in an animal carcass were the most unpleasant, effort-intensive obstacles to work through, requiring real persistence rather than a single quick effort — a fitting parallel for a person who won't be worn down or defeated easily.

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