osso duro

== Italian == === Alternative forms === osso duro da rodere === Etymology === Literally, “hard bone.” === Noun === osso duro m (plural ossi duri) (idiomatic) tough cookie, tough biscuits (idiomatic) tall order Used other than figuratively or idiomatically: see osso,‎ duro. == Portuguese == === Noun === osso duro m (plural ossos duros) (idiomatic) tough cookie (person who can endure physical or mental hardship) Used other than figuratively or idiomatically: see osso,‎ duro.