coalface

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coalface /ˈkoʊlˌfeɪs/ noun
plural coalfaces
coalface
/ˈkoʊlˌfeɪs/
noun
plural coalfaces
Learner's definition of COALFACE
[count] British
: the place inside a mine where the coal is cut out of the rock

at the coalface

British
: at the place where the actual work of an activity is done