Today's Parola del Giorno is the verb expression dirla lunga (su + qualcuno/qualcosa), which means to say a lot about someone/something.
See the expression used below:
Hai visto cosa ha fatto Marco ieri alla festa? Il suo comportamento la dice lunga sul suo carattere! Non penso di invitarlo ad un’altra festa!
Did you see what Marco did at the party yesterday? His behavior says a lot about his character. I do not think I will invite him to another party!