Do You Say Osu Too Much? A Two-Class Diagnostic

Here is a small experiment. During your next class, count.

Not obsessively, just notice. Every time you say osu, register it. Most people who try this are surprised by the number, and more surprised by how many of the instances were not answering anything.

Three kinds of osu

Sort them as you go, because they are not equivalent.

The first is a genuine acknowledgment: the instructor gave an instruction, you understood it, and you signaled that. Fine. That is what the sound is for.

The second is a courtesy marker at a moment where any word would do — bowing in, thanking a partner, acknowledging a correction you have already absorbed. Harmless.

The third is the interesting one: osu where you did not understand, did not agree, or had a question. Nearly everyone has some of these, and they are the reason the count is worth doing.

Why the third kind matters

Because a class runs on feedback, and that osu is feedback that says the opposite of the truth.

An instructor watching thirty students bark agreement has no way to know that six of them have no idea what was just asked. They will find out in about four minutes, when the six do it wrong, and they will correct the movement rather than the misunderstanding. The syllable did not cause the confusion. It hid it, which is worse, because confusion that is visible gets fixed.

What to do with the number

Very little, deliberately.

This is not an argument for a silent dojo, and a student who suddenly stops responding will read as sullen rather than thoughtful. The change worth making is narrower: when the honest answer is “I did not follow that”, say that instead. Once. In a normal voice.

The reaction tells you something about the school, and in most cases it is a good thing to learn. A club where a beginner can say they did not understand is a club that is teaching. One where the only permitted response is agreement is doing something else, and the sound was helping it along.

What fills the gap once you stop

The interesting part of the experiment is not the count. It is what comes out of your mouth in the places where the sound used to be.

Most of those slots turn out to want one of three things: an actual question, an acknowledgment that you heard the instruction but have not yet performed it, or nothing at all. The first is the one schools claim to want and the one the habit was suppressing. Removing the sound tends to produce a noticeable jump in the number of questions asked in a class, which is not because the students became curious but because the frictionless response was no longer available.

The second slot has a perfectly good answer in ordinary Japanese practice, which is that hai means you heard, not that you agree or understood. Splitting the two apart is useful in any language. A student who says they heard and then asks about the part they missed has told the instructor exactly where the lesson stopped landing.

The third slot is worth sitting with. Silence directed at a senior feels rude for about a week, then stops feeling like anything, and what is left is a room where noise carries information again.

One more thing the count tends to expose, and it is the reason the exercise is worth running rather than merely reading about. The number is almost always higher than the person guessed beforehand, frequently by a factor of several, which is a small demonstration that a verbal habit is invisible from inside while being perfectly audible to everybody else in the room.