The most common and accurate pronunciation is:
* Koh-kyoo
Breakdown:
* Koh: The "o" sound is similar to the "o" in "hot" but slightly shorter.
* kyoo: The "ky" sound is similar to the "k" in "kite" with the "yoo" sounding like the "oo" in "moon."
Note: You'll sometimes hear it pronounced with a slightly more stressed "koo" sound at the end, which is still acceptable.
Context:
"Kokyuu" often refers to breathing exercises in Japanese martial arts like Aikido.
Let me know if you have any other Japanese words you need help with!