This is the 10035th most frequent Portuguese word.
divertem
"Divertem" means "they entertain" or "they have fun."
In this sentence, 'divertem' is used to indicate enjoyment or having fun, associated with the reflexive verb 'divertir-se' and referring to the subject 'crianças'.
As crianças se divertem muito no parque.
The children have a lot of fun in the park.
Here, 'divertem' means to amuse or to entertain others (not reflexive) and refers to the subject 'eles' acting actively.
Eles divertem os convidados com suas piadas.
They entertain the guests with their jokes.
'Divertem' in this sentence also means to amuse others, applied as an action performed by 'vocês' towards 'plateia'.