osso duro de roer
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Portuguese
[edit]Etymology
[edit]Literally, “hard bone to gnaw”.
Noun
[edit]osso duro de roer m (plural ossos duros de roer, metaphonic)
- (idiomatic) hard nut to crack (problem that is challenging to solve)
- (idiomatic) hard nut to crack (situation, person, group, etc. which is difficult to overcome or deal with)
- (idiomatic) a brave or hardy person or organisation