This song is all the rage among young people right now.
その流行りの服はすぐに飽きられてしまった。
That trendy clothing quickly fell out of favor.
noun, noun which may take the genitive case particle 'no'
prevalence (e.g. of a disease)
Used for the spread or prevalence of something, especially diseases or phenomena. Often seen in news or medical contexts.
インフルエンザの流行りがピークを迎えた。
The prevalence of influenza has peaked.
Tapioca drinks became trendy starting last year.
When winter comes, the spread of the flu becomes a concern.
She's always quick to jump on the latest trend.
Young people tend to chase after trends.
fashionable thing; popular thing; craze
epidemic; plague