pull your finger out
US /pʊl jʊər ˈfɪŋ.ɡər aʊt/
UK /pʊl jʊər ˈfɪŋ.ɡər aʊt/

1.
本腰を入れる, さっさと動く, 怠けるのをやめる
to tell someone to stop being lazy and start working harder or more quickly
:
•
You need to pull your finger out if you want to finish this project on time.
このプロジェクトを時間通りに終わらせたいなら、本腰を入れなければならない。
•
Come on, pull your finger out and help us clean up!
さあ、さっさと動いて片付けを手伝って!