This is the 3896th most frequent French word.
annoncent
"Annoncent" means "announce" (third person plural of the verb "annoncer").
Here, 'annoncent' is used as a verb in the present tense to indicate the action of announcing by a subject (les journaux) in plural form.
Les journaux annoncent des nouvelles importantes.
The newspapers announce important news.
In this sentence, 'annoncent' again works as a verb describing the act of heralding or signaling, performed by 'les cloches.'
Les cloches annoncent l'arrivée des invités.
The bells announce the arrival of the guests.
The usage of 'annoncent' in this context is to declare or inform as a direct statement or communication by the subject, 'ils.'