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空気を読む kuuki wo yomu
Reading the air, not the words.
What does kuuki wo yomu mean?
Sensing the mood of a room and adjusting without anyone saying anything. It keeps things smooth and it is exhausting, which is why people who fail at it get labelled KY.
Example
そこは空気を読んで、黙っておいた。
I read the room and kept my mouth shut.
Vibe
Who you can say this to, and how it lands.
Safe to use Fine in ordinary conversation.
The story behind kuuki wo yomu
空気 is simply air, and the phrase asks you to read it. A well-known 1977 essay argued that Japanese groups are often governed not by the arguments people make but by an atmosphere that forms in the room and that nobody can afford to contradict.
The skill went from unspoken to labelled around 2007, when high schoolers started saying KY for 空気読めない, air-unreadable, and the initialism made the buzzword lists. Naming it changed it. Reading the air became something you could fail at publicly, which put real pressure on teenagers, and prompted a quiet counter-argument: sometimes the useful person in a meeting is the one who says the thing the air forbids.