Adverb (fukushi), Adverb taking the 'to' particle
soon; before long; any time now; momentarily
Onomatopoeic or mimetic word
そろそろ寝る時間だぞ。It's time you went to bed. slowly; quietly; steadily; gradually; gingerly
Onomatopoeic or mimetic word
already; about time
Onomatopoeic or mimetic wordused exhortatively or to express impatience
Also written ソロソロ