mirumiru

Adverb

1. very fast; in a twinkle; before one's eyes

Usually Written in Kana
オーナーたちは あたらしいレストランのおかげで るうちに大金 たいきんをかせいでいた。
ōnātachiwa atarashii resutoranno okagede mirumiru uchini taikin'o kaseide ita.
The new restaurant was making the owners money hand over fist.