Lexical Definition

‎ἐξηχέομαι‎ exēchéomai (ex-ay-kheh'-om-ahee) to ring/sound out ^G:V
middle voice from ‎ἐκ‎ and ‎ἠχέω‎

sound forth.

• to "echo" forth, i.e. resound (be generally reported)

Abbott-Smith

† ἐξ-ηχέω, -ῶ [in LXX: Jl 3 (4):14 (הָמוֹן), Si 40:13, III Mac 3:2 * ;]
to sound forth (as a trumpet, or thunder; v. M, Th., l.c.): pass., I Th 1:8.†

Abbott-Smith References

Liddell-Scott-Jones

ἐξηχέω-έω,

sound forth, [ἐξηχέωεῖν">LXX+2nd c.BC+] sound forth the swan's song, i.e. give vent to dying prayers, [Refs 2nd c.BC+]:—passive, [NT+5th c.AD+]

__II utter senseless sounds, of idiots, [Refs]

_{LSJ Scripture Refs: 1Thess.1.8}