普及 pǔjí to spread extensively
to spread extensively; to generalize; widespread; popular; universal; ubiquitous; pervasive
How to remember 普及: 普 widespread + 及 reach = to spread extensively.
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How it is used
- Means "to become widespread / popularize" - 智能手机已经普及 (zhìnéng shǒujī yǐjīng pǔjí) smartphones have become ubiquitous.
- Both intransitive (something spreads to everyone) and transitive (普及知识, to popularize knowledge). Stresses reaching the general public, unlike 流行 (liúxíng, to be in fashion).