This is the 10565th most frequent Catalan word.
queixar
"Queixar" means "to complain" in English.
Here, 'queixar-se' means 'to complain,' used reflexively, indicating a subject expressing dissatisfaction.
Em queixaré si no em donen el que em van prometre.
I will complain if they do not give me what they promised.
'Queixar-se' is used reflexively in the past action indicating someone expressing an issue to others.
Els teus veïns han vingut a queixar-se del soroll de la festa.
Your neighbors came to complain about the noise from the party.
'Queixar-se' here is used reflexively in a question to question someone's expression of discontent without apparent reason.