be false to one's oath

From LSJ

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

Source

English > Greek (Woodhouse Extra)

ἐπιορκεῖν