Quick Definition
I spread or stretch out
Strong's Definition
to fly out, i.e. (by analogy) to extend
Derivation: from G1537 (ἐκ) and a form of G4072 (πέτομαι);
KJV Usage: stretch forth
Thayer's Greek Lexicon
ἐκπετάννυμι: 1 aorist ἐξεπέτασα; to spread out, stretch forth: τάς χεῖρας πρός τινα, Rom_10:21 from Isa_65:2. (Euripides, Polybius, Plutarch, Anthol., others.)
STRONGS NT 1600a: ἐκπηδάωἐκπηδάω, ἐκπηδω: 1 aorist ἐξεπήδασα; to spring out, leap forth: εἰς τόν ὄχλον, Act_14:14 G L T Tr WH. (εἰς τόν λαόν, Jdt_14:17; in Greek writings from (Sophocles and) Herodotus down. Deu_33:22.)
Mounce Concise Greek Dictionary
ἐκπετάννυμι ekpetannymi 1x
pluperfect, ἐκπεπετάκειν , to stretch forth, expand, extend, Rom_10:21
ἐκπηδάω ekpēdaō 1x
to leap forth, rush out, Act_14:14
Abbott-Smith Greek Lexicon
ἐκ -πετάννυμι ,
[in LXX chiefly for H6566 , as Isa_65:2 (hithp.);]
to spread out (as a sail), stretch forth: Rom_10:21 ( LXX ).†
Moulton & Milligan — Vocabulary of the Greek NT
ἐκπετάννυμι [page 197]
For this NT ἅπ . εἰρ . ( Rom_10:21 from Isa_65:2 ) = spread out, the ἐκ showing the action of the verb carried as far as it will go (cf. ἐκτείνω ), cf. Kaibel 779 .2
Οὔριον ἐκ πρύμνης τις ὁδηγητῆρα καλείτω
Ζῆνα κατὰ προτόνων ἱστίον ἐκπετάσας .
See Anz Subsidia , p. 286.
Liddell-Scott — Intermediate Greek Lexicon
ἐκπετάννυμι fut. -πετάσω aor1 pass. ἐξεπετάσθην perf. ἐκπεπέτασμαι "to spread out", of a sail, Eur. ; of wings, Anth. ; of a net, Orac. ap. Hdt. metaph., ἐπὶ κῶμον ἐκπετασθείς "wholly given up to" revel, Eur.
STEPBible — Tyndale Abridged Greek Lexicon
ἐκ-πετάννυμι
[in LXX chiefly for פָּרַשׂ, as Isa.65:2 (hithp.) ;]
to spread out (as a sail), stretch forth: Rom.10:21(LXX).†
(AS)