Here's the answer:
“ここだけの話”
(koko dake no hanashi)
Watch a real native speaker say it:
Here's how it sounds in a textbook:
Fun fact: the hundreds of thousands of people learning Japanese with Memrise get this phrase correct 88.98% of the time!
(koko dake no hanashi)
Fun fact: the hundreds of thousands of people learning Japanese with Memrise get this phrase correct 88.98% of the time!
