This is the 6854th most frequent Catalan word.
torneu
"Return" (second-person plural imperative or present subjunctive form of "tornar").
Here, 'torneu' is the imperative form of the verb 'tornar' (to return) in the second person plural.
Torneu el llibre que vàreu agafar de la biblioteca.
Return the book you borrowed from the library.
In this sentence, 'torneu' is used to conjugate the verb 'tornar' in the second person plural future subjunctive.
Si torneu a temps, podrem anar junts al cinema.
If you return on time, we can go together to the cinema.
Here, 'torneu' is the present subjunctive form of 'tornar' for second person plural usage.