
killen
to kill
Colloquial for to kill. Often used in the context of films, video games, or casual speech.
In diesem Actionfilm killt der Held Dutzende von Gegnern.
In this action film, the hero kills dozens of opponents.
to kill
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to kill
Colloquial for to kill. Often used in the context of films, video games, or casual speech.
In diesem Actionfilm killt der Held Dutzende von Gegnern.
In this action film, the hero kills dozens of opponents.

to kill
Colloquial in a figurative sense for to end, ruin, or stop something. Often refers to plans, ideas, or moods.
Die schlechte Nachricht hat die gute Stimmung auf der Party total gekillt.
The bad news totally killed the good mood at the party.

to kill
Colloquial for to extremely strain, exhaust, or overwhelm someone or something.
Das Training heute hat mich komplett gekillt, ich bin total fertig.
Today's workout completely killed me; I'm totally exhausted.
'Killen' (to kill) is a colloquial word borrowed from English ('to kill'). In all its meanings, it is used only in informal contexts and should be avoided in formal texts.
Lass uns die Musik leiser machen, der Bass killt meine Ohren.
Let's turn the music down; the bass is killing my ears.
You can recognize the meaning of 'killen' (to kill) from the object: If it refers to an abstract thing like 'Stimmung' (mood) or 'Plan' (plan), it means 'ruin'. If it refers to a person in the context of effort, it means 'exhaust'.
Sein negativer Kommentar hat die ganze Diskussion gekillt.
His negative comment killed the whole discussion.
In the figurative meaning of ending something, 'killen' (to kill) is often used with abstract nouns. Typical combinations are 'die Stimmung killen' (to kill the mood), 'die Motivation killen' (to kill motivation), or 'die Party killen' (to kill the party).
Die plötzliche Nachricht vom Chef hat unsere Feierabendstimmung gekillt.
The sudden news from the boss killed our end-of-workday mood.
In the meaning of 'erschöpfen' (to exhaust), the subject is often the strenuous activity and the object is the person who is exhausted. The pattern is: [activity] kills [person].
Diese Hitze killt mich, ich kann mich kaum bewegen.
This heat is killing me; I can barely move.
to kill
Both verbs can refer to ending a life. “Töten” is neutral and suitable for factual statements. “Killen” is colloquial and is used especially in casual speech and in connection with films or video games; for serious real-life events, it can sound inappropriately casual.

Im Videospiel muss die Figur den gegnerischen Wachmann killen.
In the video game, the character has to kill the opposing guard.
Im Polizeibericht steht, dass der Täter den Wachmann tötete.
The police report states that the perpetrator killed the security guard.