noun, noun which may take the genitive case particle 'no'
Refers to something currently popular or in vogue, often with a nuance of being transient or trendy. Common in everyday conversation.
今、若者の間でこの曲が流行りだ。
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.