This is the 2744th most frequent Spanish word.
juegan
"Juegan" means "they play" or "you (plural) play."
Here, 'juegan' refers to the present tense third-person plural form of 'jugar,' indicating the action of playing by a group (the children) happening currently.
Los niños juegan en el parque.
The children play in the park.
In this sentence, 'juegan' again reflects present tense third-person plural usage of 'jugar,' applied to indicate skill in playing soccer.
Ellos juegan muy bien al fútbol.
They play soccer very well.
Similarly, 'juegan' pertains to 'jugar' in a group context, signifying their habitual action expected during nighttime.