Definition from Wiktionary, the free dictionary
From quid the neuter of quis (“what”) + tibi (“to you”) the dative of tū (“you”) + est (“it is”), form of esse (“to be”). Literally meaning "what is it to you?".
quid tibi est?
- (idiomatic) what's the matter?, what's wrong?
- Cistellaria by Plautus
- Quid tibi est?
- Alcesimarchum non vides? Ferrum tenet!
- What's wrong?
- Don't you see Alcesimarchus? He's got a sword!