BT MQ 10a(49) :גברא דקא נקר ריחיא‏ : a man who was hewing out a millstone
See the entire entry for nqr vb. to excise

BT MQ 10a(49) :שמעיה לההוא גברא דקא נקר ריחיא בחולא דמועדא‏ : he heard about a certain man who was hewing millstones on an intermediate festival day
See the entire entry for rḥē, re/aḥyā n.m. millstone, mill