ἐπιάχω

A. shout out, shout applause after a speech, ὣς ἔφαθ’· οἱ δ’ ἄρα πάντες ἐπίαχον Il. 7.403.
2. . shout, ὅσσον τ’ ἐννεάχιλοι ἐπίαχον 5.860.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project