Is there a (relatively) common phrase, preferably using a metaphor, which means one should not talk about things one does not really understand? I have the impression of some such phrase floating around in my memory, but all that I can think of is Do not meddle in the affairs of wizards, which is not the phrase I am looking for.

  • 1
    Things are going to get quiet real quick.
    – Hot Licks
    Apr 3, 2016 at 15:27

2 Answers 2


I've always liked:

Better to be thought a fool than to open your mouth and remove all doubt.


You are in way over your head. [Better keep your mouth shut or you'll drown.]


A phrase I often use...

I'm out of my depth!

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