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This question already has an answer here:

逮捕しといてくれ。

I know the sentence is a command/plea, and that's why くれ, but I don't understand the しといて. Why is that or what does it mean?

marked as duplicate by macraf, 永劫回帰, Dono, broccoli forest, Chocolate Sep 5 '17 at 1:59

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しといて is a contraction of しておいて (cf. ておく : do something as preparation for some purpose). Arrest him so he doesn't cause any more trouble.

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