When people say you shouldn't be afraid to say I don't know they don't mean say 'I don't know' and then stare in silence at the person asking the question. How

When people say you shouldn't be afraid to say I don't know they don't mean say 'I don't know' and then stare in silence at the person asking the question. How you phrase the whole response is important, as it is with every response in an interview, but what more people need to realize that the phrase 'I don't know' is not something that should never be uttered or admitted.