Grand'peine (en. Great pain)
/ɡʁɑ̃.pɛn/
Slang Meanings
To strain oneself to do something.
He had to strain himself to finish his project on time.
Il a dû s'éreinter à finir son projet à temps.
To shake things up.
They only managed by shaking things up.
Ils ne s'en sont sortis qu'en bousculant les choses.