
klagen über
to complain about
To complain about something negative or express one's suffering about it.
Die Mitarbeiter klagen über die hohe Arbeitsbelastung.
The employees complain about the heavy workload.
to complain / sue / lament
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to complain about
To complain about something negative or express one's suffering about it.
Die Mitarbeiter klagen über die hohe Arbeitsbelastung.
The employees complain about the heavy workload.

to sue
To sue a person or institution in court in order to enforce a claim.
Der Mieter klagt gegen die ungerechtfertigte Kündigung.
The tenant is suing over the unjustified termination.

to lament
To express grief or pain loudly and emotionally; to wail.
Sie klagte laut, als sie die traurige Nachricht erhielt.
She lamented loudly when she received the sad news.
You can recognize the meaning of 'klagen' from the preposition: 'klagen über' means to complain, 'klagen gegen' means to sue someone. Without a preposition in an emotional context, it often means 'to wail' or 'to express grief'.
Er klagt über das schlechte Wetter.
He complains about the bad weather.
The verb 'klagen' is closely connected to the noun 'die Klage'. 'Die Klage' can mean both a complaint and a lawsuit in court.
Der Anwalt hat die Klage beim Gericht eingereicht.
The lawyer filed the lawsuit with the court.
When you complain about something, always use the preposition 'über' followed by the accusative. This pattern is fixed.
Viele Menschen klagen über zu viel Stress bei der Arbeit.
Many people complain about too much stress at work.
In the legal sense, 'klagen' is used with 'gegen' + accusative (the person/company) or 'auf' + accusative (the goal, e.g., damages).
Das Unternehmen klagt auf Schadensersatz in Höhe von einer Million Euro.
The company is suing for damages amounting to one million euros.
to whine / lament
Klagen and jammern can both mean expressing suffering or dissatisfaction. Klagen can remain neutral. Jammern usually characterizes the expression as self-pitying, annoying, or exaggerated.

Die Fahrgäste klagen über die lange Wartezeit.
The passengers are complaining about the long wait.
Die Fahrgäste jammern schon wieder über die lange Wartezeit.
The passengers are whining about the long wait again.