Lexical Definition

‎ἐπισπάομαι‎ epispáomai (ep-ee-spah'-om-ahee) to uncircumcise ^G:V
from ‎ἐπί‎ and ‎σπάω‎

become uncircumcised.

• to draw over, i.e. (with ‎ἀκροβυστία‎ implied) efface the mark of circumcision (by recovering with the foreskin)

Abbott-Smith

ἐπι-σπάω, -ῶ [in LXX: Is 5:18 (מָשַׁךְ), etc. ;]
to draw on: mid., in peculiar sense of effacing signs of Judaism (cf. I Mac 1:15, FlJ, Ant., xii, 5, i; v. Thayer, s.v.), to become as uncircumcised: I Co 7:18.†

Abbott-Smith References

Liddell-Scott-Jones

ἐπισπάω-σπάω,

draw or drag after one, [Refs 5th c.BC+]; ἦγ᾽ ἐπισπάωσπάσας κόμης by the hair, [Refs 5th c.BC+]:— middle, [Refs 5th c.BC+] —passive, ἐπισπάωσπασθῆναι τῇ χειρί with the hand, [Refs 5th c.BC+]

__2. metaphorically, bring on, cause, τοσόνδε πλῆθος πημάτων [Refs 4th c.BC+]
__3. pull to, τὴν θύραν [Refs 5th c.BC+]; compare ἐπισπάωσπαστήρ: ἐπισπάωσπασθέντος τοῦ βρόχου being drawn tight, [Refs 4th c.BC+]
__4. attract, gain, win, πέποιθα τοῦτ᾽ ἐπισπάωσπάσειν κλέος [Refs 5th c.BC+]:—frequently in middle, ἐπισπάωσπᾶσθαι κέρδος [Refs 5th c.BC+]; ἔχθραν [Refs 6th c.AD+]; welcome, [Refs 1st c.AD+]; ἐπισπάωσπᾶσθαι πώγωνα get one a beard, [Refs 2nd c.AD+]; induce, ὕπνον ἐκπώμασιν [Refs 4th c.AD+]; attract, σίδηρον [Refs 1st c.BC+]
__5. draw on, allure, persuade, τὴν ψυχήν [Refs 5th c.BC+]:—middle, ὁ λόγος.. ἂν ἐπισπάωσπάσαιτο [Refs 5th c.BC+]; ἐ. ἡ πέρδιξ [τὸν θηρεύοντα] [Refs 4th c.BC+]; θάτερον παρεμπῖπτον ἐπεσπάσατο.. τὸ ἕτερον ἐπισπάωνόημα induced, provoked, [Refs 4th c.BC+] G.: c.infinitive, induce to do, ἐπισπάωσπάσασθαι [ἂν] αὐτοὺς ἡγεῖτο προθυμήσεσθαι he thought it would induce, invite them to make the venture, uncertain reading in [Refs 5th c.BC+]; ἐπισπάωσπᾶσθαί τινα ἐμπλησθῆναι δακρύων τὰ ὄμματα [Refs 5th c.BC+]; but τοὺς πολεμίους εἰς τόπους allure, entice, [Refs 2nd c.BC+] —passive, ἐπισπάωσπώμενον εἰς τἀναντία πολλάκις ἅμα though often he is being drawn in opposite directionsatonce, [Refs 5th c.BC+]; φοβοῦμαι μὴ πάντες.. ἐπισπάωσπασθῶσιν πέρα τοῦ συμφέροντος [πολεμῆσαι] [Refs 4th c.BC+]; ἐπεσπάσθην φιλονεικεῖν [Refs 2nd c.BC+]
__6. middle, absorb, τὰ σιτία -σπᾶται τὴν ὑγρότητα [Refs 4th c.BC+]; quaff, of a drinker, ἀπνευστὶ ἐ. [Refs 2nd c.AD+]; of infants, suck, γάλα [Refs 2nd c.AD+]; of cupping instruments, [Refs 5th c.BC+]; draw in, πνεῦμα [Refs 1st c.BC+]:—passive, of air, to be sucked in, [Refs 4th c.BC+]
__7. middle, draw in, call in, Πύρρον [Refs 2nd c.BC+]; φυλακὴν καὶ βοήθειαν παρά τινος[Refs 1st c.BC+]:—passive, to be called in, forced to work, εἴς τι [Refs 2nd c.BC+]
__8. in passive, of the sea, ἐπισπάωσπωμένη βιαιότερον returning with a rush after having retired, [Refs 5th c.BC+]
__II. overturn: hence proverbial, ὅλην τὴν ἅμαξαν ἐπεσπάσω you have `upset the apple-cart', [Refs 2nd c.AD+]
__III. middle, draw the prepuce forward, become as if uncircumcised, μὴ ἐπισπάωσπάσθω [NT]; of the nurse, ἐπισπάωσπάσθω τὴν ἀκροποσθίαν [Refs 2nd c.AD+]

_{LSJ Scripture Refs: 1Cor.7.18}