das Todesopfer
fatality
A person who has died in an accident, disaster, crime, or war.
Der schwere Verkehrsunfall forderte drei Todesopfer.
The serious traffic accident resulted in three fatalities.

fatality
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fatality
A person who has died in an accident, disaster, crime, or war.
Der schwere Verkehrsunfall forderte drei Todesopfer.
The serious traffic accident resulted in three fatalities.

The word is made up of 'der Tod' (death), the linking '-es', and 'das Opfer' (victim). So it literally means a person who has become a 'victim of death'.
Die Bergsteiger wurden zu Todesopfern eines plötzlichen Wetterumschwungs.
The mountain climbers became fatalities of a sudden change in the weather.
'Todesopfer' (fatality) is very often used with the verb 'fordern' (to claim). A disaster or an accident 'claims' a certain number of fatalities. Other typical verbs are 'beklagen' (to mourn/report) or 'geben' (to be/have).
Das Erdbeben hat leider Hunderte von Todesopfern gefordert.
Unfortunately, the earthquake claimed hundreds of lives.
'Todesopfer' (fatality) is a formal word used mainly in the news, in newspaper articles, and in official reports about accidents, wars, or disasters.
Die Polizei hat die genaue Zahl der Todesopfer noch nicht bestätigt.
The police have not yet confirmed the exact number of fatalities.
victim / sacrifice
'das Opfer' and 'das Todesopfer' both refer to people affected by a terrible event. The important difference is this: a victim may have been injured, harmed, or killed. A fatality has always died. That is why 'Todesopfer' is more specific when you want to say explicitly that someone lost their life in an accident, war, crime, or disaster.

Nach dem schweren Sturm meldeten die Behörden zwei Todesopfer.
After the severe storm, the authorities reported two fatalities.
Das Opfer des Betrugs verlor viel Geld, wurde aber nicht verletzt.
The victim of the fraud lost a lot of money but was not injured.