take no prisoners

Implying that one kills all one's enemies instead of capturing them.

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take no prisoners (third-person singular simple present takes no prisoners, present participle taking no prisoners, simple past took no prisoners, past participle taken no prisoners)

1. (idiomatic) To be uncompromising.
   • 2015 January 21, “Ex Machina: Quest to create an AI takes no prisoners”, in (Please provide the book title or journal name)‎, New Scientist:

     It’s a rare thing to see a movie about science that takes no prisoners intellectually.

2. Used other than figuratively or idiomatically: see take,‎ prisoner.

• no quarter