Never be afraid to ask what something means, no matter how junior or senior you are, and moreover no matter how junior or senior the person you are asking.
There’s no such thing as a stupid question.
If someone reacts negatively towards a question, it’s a bad characteristic of that person and is not a reflection on yourself. It takes confidence to ask questions, especially when it’s a topic you feel you should be an authority on.
Nobody knows everything, but rest assured:
There’s things you know that others do not.