auf einen Streich
Meanings
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A fun look at the family of "streichen" and what painting your wall has to do with emphasis, petting your cat and pranks.
Vocab:
streichen, durchstreichen, der Strich, der Aufstrich, der Abstrich, streicheln, der Streich

Word Family
The core idea of this root was:
stroking, rubbing
The German source I am using (DWDS.de) says that it’s probably an extension of the root *ster- which was about spreading, stretching out (find more here: *ster(e)-) .
This would mean that besides streichen, also Strahl (ray), streifen (strip) and streuen (strew) would be part of this family, but the English sources I have seen do not mention this at all.
English family members are definitely related are strike, stroke, stripe and streak.