This is the 13658th most frequent German word.
einbüßen
To lose or forfeit something.
Here, 'einbüßen' signifies losing an intangible asset, such as reputation, due to circumstances.
Die Firma musste ihren guten Ruf einbüßen.
The company had to forfeit its good reputation.
In this sentence, 'einbüßen' is used in the context of losing personal qualities, like self-confidence.
Nach dem Unfall hat er viel Selbstvertrauen eingebüßt.
After the accident, he forfeited a lot of self-confidence.
Here, 'einbüßen' is employed to indicate the loss of tangible resources, such as revenue.