πρόκα
From LSJ
ἀγὼν πρόφασιν οὐκ ἐπιδέχεται οὐδὲ φιλία → no excuse is allowed by a contest or by a friendship
English (LSJ)
Ion. Adv.
A forthwith, straightway, Hp. ap. Gal.19.132, A.R. 1.688; in Hdt. πρόκα τε or πρόκατε, 1.111, 6.134, 8.65, 135; so also in Call. in PSI19.1092.52.