5. “Let me get back to you on that.”
15 Credibility-Killing Phrases to Banish from Your Vocabulary
Larry Kim

I’m not sure I agree with this one though. Sure, it doesn’t sound great, especially depending on the context.

But at the same time, if there’s something you don’t know, doesn’t that show you’re 1. brave enough to say it and 2. that you’re willing to go and learn what you are missing?

Ideally you would know everything. But if not, how should you handle it?