divertir

transitive verb

1. to entertain, to amuse

divertirse

pronomial verb

1. to enjoy oneself

se divirtieron muchísimo en la excursión -> they had a great time on the trip, they really enjoyed the trip

se divierte con cualquier cosa -> she's easily amused

¡que te diviertas/os divirtáis! -> have a nice time!, enjoy yourself/yourselves!