Hi
I bumped into this idiom today.
-- but we must keep our powder dry.
Could you please tell me how common it is among native speakers?
Thanks,
Tom
not very
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It's not in any of the lists here:
https://www.ef.com/wwen/english-resources/english-idioms/
All of those are very frequently used. If you do not know all of those, it's a go-to place to start.