What does 空気を読む Kuuki Wo Yomu mean?

To read the air is to perceive what a group is feeling without being told, and to adjust accordingly. It is offered constantly in English writing as a distinctively Japanese social skill, and English has a phrase that means very nearly the same thing.

The phrase

空気 (kuuki) is air, both the physical stuff and the atmosphere of a place. 読む (yomu) is to read, used for text and also for situations, weather and intentions.

Reading the air, then, with the same metaphorical extension English performs when it reads a room or reads a person.

The comparison usually left out

English says read the room. It means noticing the unspoken mood and adjusting, and telling someone they failed to read the room is a common criticism.

Any account presenting the Japanese phrase as evidence of an exceptional social sensitivity has to explain why the English idiom exists and is used the same way. Usually the account does not mention it.

What is genuinely different

Not the ability but the weight placed on it. The Japanese phrase is used more, applied to more situations, and failing at it draws sharper criticism, to the point that an initialism for people who cannot do it circulates as ordinary slang.

That is a claim about how much a society requires of the skill, which is testable and modest, and it is a different claim from saying the skill is unavailable elsewhere.

The criticism inside Japanese

The expectation is itself contested domestically. Requiring everyone to sense the mood and conform to it is a way of enforcing consensus without anyone having to state a position, which makes disagreement expensive and puts the burden on whoever notices the problem.

Japanese commentary makes exactly this argument. Importing the phrase as an admirable trait skips the argument, which is the same flattening that happens to gaman.

The fair summary

A universal skill with an unusually prominent name, a heavier social requirement attached to it, and a live domestic debate about whether that requirement is healthy. All three parts belong, and English accounts usually keep only the first.