I make it very clear to those around me that no question is too stupid to be asked and nobody is going to be reprimanded for asking basic questions.

I once had an awful manager (a terrible human being overall) who wanted to censure people for their questions; I'm pretty sure he was trying to hide his insecurities and was actually in panic that his project decisions would be revised.

So I really don't want that kind of environment where I work.

PS. And that is the exact phrase I often use.