"Whether you're a beginner or a seasoned karateka, this book will deepen your appreciation and understanding of 'OSU,' enriching your practice and respect for karate." — Lyoto Machida, former UFC Light Heavyweight Champion

The true meaning and origins of the word "OSU" are finally revealed!

No matter where in the world you are, enter any karate dojo and the term most frequently heard is "OSU!" Karate's Universal Codeword is the first thorough examination of the origins and use of this word in the martial arts, and the fascinating story of how it has spread worldwide.

Its use has exploded far beyond karate into other martial arts like judo, aikido, Brazilian jiu-jitsu, kickboxing and mixed martial arts making it arguably the most frequently uttered Japanese word in the world. Yet ironically, very few martial artists (even in Japan) know the true origins and the deeper meaning behind the term. Although it is universally used, it remains a total mystery to everyone. This book promises to finally reveal the truth behind the word OSU and its fascinating origins.