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流行っている

in fashion; trendy; popular; going around or spreading (for an illness)

→ 流行る
phrase Rare #42,276
in fashion; trendy; popular; going around or spreading (for an illness) Usually means “in fashion,” “trendy,” or “popular,” especially for clothing, styles, and products. With illnesses, it means “going around” or “spreading.”
JA: 女の子の間で今、ジーパンが流行っている。
EN: Jeans are in fashion among girls now.

今、ごく小さなペットが流行っている。

Tiny pets are all the rage right now.

女の子の間で今、ジーパンが流行っている。

Jeans are in fashion among girls right now.

多分、今、流行っている病気でしょう。

It’s probably the illness that’s going around right now.