HSK 5
纷纷
fēnfēn形副
one after another; in succession; one by one; continuously
听到消息大家纷纷报名。
Tīng dào xiāo xi dà jiā fēn fēn bào míng.
Everyone signed up one after another after hearing the news.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 5.