ἀποφθέγγομαιapophthéngomai

Same root

• ἀπόapó · G575"off," i.e. away (from something near), in various senses (of place, time, or relation; literal or figurative)
• φθέγγομαιphthéngomai · G5350to utter a clear sound, i.e. (generally) to proclaim

Where it appears

Appears 3 times in the Bible.

• Acts 2:4 And everyone present was filled with the Holy Spirit and began speaking in other languages, as the Holy Spirit gave them this ability.
• Acts 2:14 Then Peter stepped forward with the eleven other apostles and shouted to the crowd, “Listen carefully, all of you, fellow Jews and residents of Jerusalem! Make no mistake about this.
• Acts 26:25 But Paul replied, “I am not insane, Most Excellent Festus. What I am saying is the sober truth.