What does 'OSU' really mean?

A Word That Carries a World of Meaning

If you’ve trained in Kyokushin karate for more than five minutes, you’ve probably heard “Osu.” It’s spoken when greeting someone, acknowledging instructions, or showing respect. But “Osu” is far more than a simple dojo catchphrase — it’s a deeply rooted expression that represents the heart and soul of Kyokushin philosophy.

In Japanese, “Osu” is short for Osu no Seishin, which roughly translates to "to persevere with patience.” Within those four letters lies a mindset of respect, humility, and indomitable spirit.

The Origins of “Osu” in Kyokushin

While “Osu” can be found in other Japanese martial arts, it’s in Kyokushin that the word truly comes to life. Mas Oyama, the founder of Kyokushin, emphasised that martial arts were not just about physical strength, but about developing character. “Osu” became the verbal embodiment of that idea — a reminder to push forward no matter the challenge, and to treat every person with respect, from white belts to seasoned black belts.

Three Core Meanings of “Osu”

1. Respect for Others

When you bow and say “Osu” to a fellow student or instructor, you acknowledge them as an equal on the martial path. It’s a way of saying, “I see your effort, I honour your journey.”

2. Perseverance Through Difficulty

Kyokushin training is famous for its intensity — hundreds of kicks, deep stances, full-contact sparring. “Osu” is the verbal promise to keep going, even when your legs are shaking or your lungs are burning.

3. Humility and Openness

By saying “Osu” when receiving feedback, you’re showing willingness to learn and improve, even if the critique is tough to hear.

How to Apply “Osu” Beyond the Dojo

In Work and Study

Deadlines, long meetings, or challenging projects are your “kumite” outside the dojo. “Osu” reminds you to stay patient, adapt, and push through without losing focus.

In Personal Goals

Whether it’s fitness, learning a new skill, or saving for a big goal, the “Osu” mindset helps you stick to your plan even when motivation dips.

In Relationships

“Osu” isn’t just about physical endurance — it’s about emotional endurance too. Listening with respect, staying patient in disagreements, and showing humility in friendships or family life are all part of living “Osu.”

Living the Spirit of Kyokushin

For many students, “Osu” becomes more than just a dojo word. It becomes a quiet mantra in tough moments — before stepping into a job interview, when pushing through a final rep at the gym, or when facing a personal challenge head-on.

The next time you bow in and say “Osu,” take a second to think about what you’re truly committing to: respect for others, perseverance through challenges, and humility in growth. That’s the real strength of Kyokushin.