good question!

good question

A phrase used when one does not know the answer to a question. Good question! I'll ask Marie to clarify that. Hmm, that's a good question—let me check my sources.
See also: good, question

ˌgood ˈquestion!

(spoken) used to show that you do not know the answer to an important question: ‘How much is all this going to cost?’ ‘Good question!’
See also: good