coalface

Từ điển Việt Anh Việt 4in1 - English Vietnamese 4 in 1 Dictionary

coal‧face /ˈkəʊlfeɪs $ ˈkoʊl-/ BrE AmE noun British English
1. [countable] the part of a coal mine where the coal is cut from the ground
2. at the coalface where the real work is done, not just talked about:
Academics will be working at the coalface alongside the doctors.