Today's Parola del Giorno is the verb expression entrare in vigore, which means to come into force or to come into effect.
It is usually used to describe a new law or proclamation that has come into force.
See the expression used below:
Ieri è entrata in vigore una legge che vieta a chi ha meno di 14 anni di entrare nei locali dopo una certa ora. Penso che sia una buona legge, ci voleva proprio.
Yesterday a law came into effect that prohibits those under 14 years old from entering clubs after a certain hour. I think this is a good law that was really needed.