1.
to be popular, to be in fashion
To be widely adopted or enjoyed.
この歌が流行っている。
This song is popular.
今、どんなファッションが流行っていますか。
What fashion is popular now?
この店は若い人の間で流行っている。
This shop is popular among young people.
2.
to spread, to be prevalent
For a disease or trend to become widespread.
インフルエンザが流行っている。
The flu is going around.
去年の冬は風邪がとても流行った。
Colds were very prevalent last winter.
学校で新しいゲームが流行っているらしい。
Apparently a new game is popular at school.
流行る is an intransitive godan verb meaning something becomes popular or widespread.
TRANSITIVITY:
自動詞 (intransitive) - the subject spreads/becomes popular on its own.
ASPECT (ている):
流行っている means "is currently popular/going around."
READINGS:
- 流行る (verb): to be popular, to spread
- 流行 (noun): trend, fashion, epidemic
USES:
1. Positive: trends, fashion, songs, games
2. Negative: diseases, epidemics (流行り病)
RELATED EXPRESSIONS:
- 流行り物: something trendy
- 流行語: buzzword, trendy word
- 大流行: huge trend, pandemic