γρύπτω
From LSJ
ἐν πίθῳ τὴν κεραμείαν μανθάνειν → in breaking many pots, the potter learns his craft | of those who undertake the most difficult tasks without learning the elements of the art | don't run before you can walk
English (LSJ)
A become bent or wrinkled, Hsch.: aor. 2 ἔγρυπον, become wrinkled: metaph. of the earth in an earthquake, Melanth.Hist.1: in pf. part. Pass., γᾶν ἐγρυμμέναν Annuario 3.195 (Gortyn).