noun, noun or participle which takes 'suru', intransitive verb
rolling up one's sleeves
Literally rolling up sleeves; also used figuratively for getting ready to work hard or tackle something with energy.
彼は腕まくりをして皿洗いを始めた。
He rolled up his sleeves and started washing the dishes.
さあ、腕まくりして頑張ろう。
Alright, let's roll up our sleeves and do our best.