προτρίβω

A. rub up or powder beforehand, Hp. Mul. 2.133, Dsc. 1.98.
2. rub first, τὰς δᾷδας ἐν τῇ τέφρᾳ Sch.Arat. 1035 (προστρ‐ codd.).
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project