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押忍Osu / Oss: What It Means in Karate

Osu (also written Oss; 押忍) is a short, forceful martial-arts interjection used as an all-purpose “yes / understood / I’ll persevere / thank you / hello.” In dojos that use it, it acknowledges an instructor, answers a command and greets partners — but it is dojo-dependent, and some traditional teachers discourage it.

Meaning and origin

Two accounts circulate. The popular dojo interpretation reads the kanji 押忍 as “osu” (push) + “shinobu” (endure) — “push and endure,” i.e. persevere under pressure. This meaning is promoted especially in Kyokushin. But this is a retrofitted reading, not a proven derivation.

The more historically credible origin is a contraction of a polite greeting — either Ohayō gozaimasu (good morning) or Onegaishimasu (please/let’s train) — clipped down to “Osu,” traceable to early-20th-century Japanese military academies and university clubs.

Should you say it? (the nuance)

Usage is genuinely divided:

  • It is heavy in Kyokushin and common in many Shotokan and sport dojos, especially in the West.
  • Many traditionalists (including JKA-lineage and Okinawan teachers) discourage it — it is a rough, masculine, slangy word with militaristic overtones, and it is not part of classical Okinawan etiquette, where “Hai” (“yes”) is preferred as more humble.
Practical advice. Follow your own dojo’s convention. In Japan or Okinawa, or when unsure — especially with someone senior to you — default to “Hai.”

Frequently asked questions

What does “Osu” mean in karate?
It is an all-purpose expression of respect, understanding and perseverance — “yes / understood / I’ll endure.” A popular dojo interpretation reads the kanji 押忍 as “push and endure.”
Is it spelled Osu or Oss?
Both romanise the same Japanese word. The final “u” is often devoiced in speech, so it sounds like “Oss.” Spelling is a transliteration choice, not a difference in meaning.
Do Shotokan dojos say Osu?
Many do, especially in the West, but it is not universal and is far more central to Kyokushin. Some traditional JKA and Okinawan instructors discourage it as too rough or militaristic.
Is it rude to say Osu?
It can be. In everyday Japanese it sounds coarse and very masculine, and it isn’t traditional Okinawan etiquette (where “Hai” is preferred). Whether it’s appropriate depends entirely on your dojo’s culture.