ἐπίβδα

A. the day after a festival, Sch.Pi. P. 4.249, EM 357.54 (pl.); esp. the day after the three days of the Apaturia, Hsch.s.v. ἐπιβάδαι: proverb., ἕρπειν πρὸς τραχεῖαν ἐπίβδαν come to hard reckoning (on the day after the feast, when the guests suffer from excess), Pi. P. 4.140; χαῖρε . . ταῖς ἐπίβδαις Cratin. 323.
2. . new-year's day, Aristid. Or. 51 (27).26 (pl.).
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project