κατ' ἴχνος

From LSJ

κόσμος σκηνή, ὁ βίος πάροδος· ἦλθες, εἶδες, ἀπῆλθες → The world is a stage, life is your entrance: you came, you saw, you departed (Democritus fr. 115 D-K)

Source

Greek > English (Woodhouse)

on the scent, on the track, on the trail