If you live in Japan or have watched animes like Mashle: Magic and Muscles or Hunter x Hunter, you have probably heard characters exclaiming an energetic “Osu!”. But what does this word really mean? Is it just a casual greeting or is there a deeper meaning? In this article, we will explore the origin, different uses, and cultural impact of the term “Osu” (or “Oss”), as well as analyze how it appears in popular animes.
Table of Contents
The Origin and Meaning of “Osu”
The word “Osu” (押忍) originates from Japanese culture and can be written with the characters 押 (osu, meaning “to press” or “to push”) and 忍 (shinobu, meaning “to endure” or “to persevere”). This combination reflects a concept of resistance and determination, something essential in Japanese martial arts.
The term became popular especially in karate, where it is used to greet, show respect, or acknowledge an instruction from the instructor. However, its use has expanded to various situations in Japan, from casual conversations to sports and gyms.
The Main Meanings of “Osu”
- Greeting and Respect: In many martial arts, “Osu” is a respectful form of greeting among practitioners.
- Affirmation and Agreement: In training or challenges, saying “Osu!” can mean “Understood!” or “Yes, sir!”.
- Determination and Perseverance: It represents the mindset of enduring difficulties with strength and courage, an essential concept in samurai culture.

The Use of “Osu” in Animes
In animes, “Osu” is often associated with determined, tough characters or those linked to martial arts. Let’s see how it appears in some popular series.
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In Mashle, the protagonist Mash Burnedead is known for his absurd physical strength, compensating for his lack of magic with superhuman muscles. Mash has a simple and straightforward way of speaking, and one of the words he frequently repeats is “Osu”.
Mash uses this word in various situations:
- As a short response to direct questions;
- To show that he understood an instruction;
- In moments of calm acceptance, without much emotion.
His use of “Osu” reflects his carefree personality, but also his mental strength and unwavering determination.

Anime Characters that Say Osu
Another anime where “Osu” appears frequently is Hunter x Hunter, especially in the “Heaven’s Arena” arc. Unlike Mash, Gon uses “Osu” in a more energetic and friendly way, often as a greeting to friends or as a way to show enthusiasm.
Besides Mashle and Hunter x Hunter, there are other animes where “Osu” appears often, such as:
- Baki: Being an anime focused on martial arts, “Osu” is often said by fighters.
- Naruto: Ninjas and warriors like Rock Lee and Guy Sensei often use “Osu” in motivational contexts.
Conclusion
“Osu” is not just a simple greeting, but a term loaded with meaning. It represents strength, respect, and determination, being widely used both in martial arts and in everyday life.
Whether on the mat, at the gym, or among friends, “Osu” is a word that carries the spirit of perseverance and camaraderie. So, the next time you watch a fighting anime or train, you already know what to respond with confidence: Osu!


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