Lexical Definition

‎φθέγγομαι‎ phthéngomai (ftheng'-gom-ahee) to speak G:V
probably akin to ‎φέγγος‎ and thus to ‎φημί‎

speak.

Usage: 14 forms in 15 verses
Form Translated As     In Verse(s)
φθεγξάσθωσαν let them utter LXX.Jer.9.17
φθεγξάμενοσ The one uttering a sound LXX.Lam.1.12
φθεγξάμενον having spoken 2Pet.2.16
φθεγγόμενοι speaking words 2Pet.2.18
φθεγγόμεναι uttering sounds LXX.Nah.2.7
φθέγξονται They will utter LXX.Ps.94.4
shall utter a sound LXX.Jer.51.14
φθέγξομαι I will utter LXX.Ps.78.2
φθέγξεται shall utter its sounds LXX.Hab.2.11
φθέγξασθε utter LXX.Judg.5.10
φθέγξαιτο utter sound LXX.Ps.119.172
φθέγγεται utter sounds LXX.Prov.18.23
φθέγγεσθε you utter a sound LXX.Job.13.7
φθέγγεσθαι to speak Acts.4.18
εφθέγξατο uttered a sound LXX.Amos.1.2

Abbott-Smith

φθέγγομαι [in LXX for ענה, נבע hi., etc. ;]
of men or animals, to utter a sound or voice: absol., Ac 4:18; seq. ἐν φωνῇ, II Pe 2:16; c. acc., ὑπέρογκα, ib. 18.†

Abbott-Smith References

Book Refs
Acts 4:18
2 Peter 2:16 · 2:18

Liddell-Scott-Jones

φθέγγομαι,

[Refs 8th c.BC+]: future φθέγξομαι [Refs 8th c.BC+]aorist ἐφθεγξάμην, Epic dialect and poetry φθεγξάμην [Refs 5th c.BC+]perfect ἔφθεγμαι, 2nd pers. singular ἔφθεγξαι [Refs 5th c.BC+], 3rd.pers. singular ἔφθεγκται (transitive) [Refs 4th c.BC+]: —utter a sound or voice, especially speak loud and clear, frequently in [Refs 8th c.BC+] (properly of all animals that have lungs, [Refs 4th c.BC+]

__I of the human voice, ἀνθρωπηΐῃ φωνῇ φ. [Refs 8th c.BC+]; with a participle expressing the kind of cry, φθέγξομ᾽ ἐγὼν ἰάχουσα [Refs 8th c.BC+]; also of weak, small voice, φθεγξάμενος ὀλίγῃ ὀπί [Refs 8th c.BC+]; of the battle-cry, [Refs 5th c.BC+]; of the recitative of the chorus, [Refs 5th c.BC+]; οὐδ᾽ ἂν φθέγξασθαι δυνηθείη would not be able to utter a syllable, [Refs 5th c.BC+]; εἶτα σὺ φθέγγει..; open your mouth.. ? [Refs 4th c.BC+]; of children just born, [Refs 4th c.BC+]:—Constr.:—with accusative cognate, utter, ἔπος [Refs 5th c.BC+]; ἀράς, λόγους, βλασφημίαν, [Refs 5th c.BC+]; τἀληθῆ [NT+5th c.BC+]: the person addressed added with a preposition, φ. εἰς ἡμᾶς [Refs 5th c.BC+]; later τισί, [Refs 5th c.BC+]; τὸ φθεγγόμενον, absolutely, that which uttered the sound, [Refs 5th c.BC+]
__I.2 of animals, as a horse, neigh, whinny, [Refs]; of an eagle, scream, [Refs 5th c.BC+]; of a raven, croak, [Refs 4th c.BC+]; of a fawn, cry, [Refs 3rd c.BC+]; of birds, opposed to ἄφωνοί εἰσι, [Refs 4th c.BC+]; of worms, φ. οἷον τριγμόν [Refs 4th c.BC+]; of certain fish, [Refs 4th c.BC+]
__I.3 of inanimate things, of a door, creak, [Refs 5th c.BC+]; of thunder, [Refs 5th c.BC+]; of trumpets, [Refs]; of the flute, [Refs 6th c.BC+]; of the lyre, φόρμιγξ φ. ἱρὸν μέλος [Refs 4th c.BC+]; of an earthen pot, εἴτε ὑγιὲς εἴτε σαθρὸν φ. whether it rings sound or cracked, [Refs 5th c.BC+]; φ. παλάμῃσι to clap with the hands, [Refs 4th c.AD+]
__II ={ὀνομάζω}, to name, call by name, [Refs 5th c.BC+]; τῷ πλέγματι τούτῳ τὸ ὄνομα ἐφθεγξάμεθα λόγον gave it the name of λόγος, [Refs]; φ. γιγνόμενα speak of things as coming into existence, [Refs]; καὶ τὸν κύλλαστιν φθέγγου use the word κ., [Refs 5th c.BC+]; also τῇ δυνάμει ταὐτὸν φ. have the same meaning, [Refs 5th c.BC+]
__III with accusative person, sing, or celebrate one aloud, [Refs 5th c.BC+]; also, tell of, recount, θεῶν ἔργα [Refs 6th c.BC+]

LSJ Scripture Refs: 2Pet.2.18