Strong's 1832 (ἔξεστι)

be lawful, let, X may(-est)

so also neuter present participle of the same (with or without some form of G1510 (εἰμί) expressed); impersonally, it is right (through the figurative idea of being out in public)

third person singular present indicative of a compound of G1537 (ἐκ) and G1510 (εἰμί);