αἰνιγμός
From LSJ
ὁδὸς ἄνω κάτω μία καὶ ὡυτή → the road up and the road down is one and the same, the upward path and the downward path are the same
English (LSJ)
ὁ,
A riddle, mostly like αἴνιγμα in pl., δι' αἰνιγμῶν ἐρεῖν Ar. Ra.61, cf. Pl.Ti.72b, Aeschin.3.121; ἐν αἰνιγμοῖσι σημαίνειν τι E. Rh.754; ἐν αἰ. λαλεῖν Anaxil.22.23: sg., Callisth. ap. Ath.10.452a.