ἐγχημάομαι

From LSJ

τίς δ' οἶδεν εἰ τὸ ζῆν μέν ἐστι κατθανεῖν, τὸ κατθανεῖν δὲ ζῆν κάτω νομίζεται → who knows if life is death, and if in the underworld death is considered life

Source

Spanish (DGE)

abrir la boca, quedarse boquiabierto Hsch., cf. χήμη.