ἐπὶ ξυροῦ γὰρ ἀκμῆς ἔχεται ἡμῖν τὰ πρήγματα → our affairs are balanced on a razor's edge, our affairs are set upon the razor's edge
impf. de ἔπειμι¹.
ἐπῆν: impf. к ἔπειμι I.