This is the 13406th most frequent German word.
beklagen
To complain or lament.
The verb 'beklagen' with 'sich' (reflexive form) is used to express dissatisfaction or complaint about a situation.
Er beklagt sich über das schlechte Wetter.
He complains about the bad weather.
In this usage, 'beklagen' is non-reflexive and means to lament or express sorrow about something.
Die Bürger beklagen den Zustand der Straßen.
The citizens lament the condition of the roads.
Here, 'beklagen' is used reflexively in a negative sentence to indicate the absence of complaints regarding a certain topic.