κήρυσσω (kēryssō). vb. to preach or proclaim. Refers to publicly preaching or proclaiming
a message.
This verb refers to publicly proclaiming a message; the word kēryssō itself does not encode the idea
that the message is good, but it is often used in the nt for proclaiming the
message about Jesus, which is fundamentally good news. The writers of the nt
gospels use it refer to John the Baptist preaching (e.g., Matt 3:1; Mark 1:4;
Luke 3:3) and to Jesus preaching (e.g., Matt 4:17; Mark 1:14). Jesus also uses
it to refer to his own preaching (e.g., Mark 1:38). Acts (e.g., Acts 10:42;
28:21) and the letters of the nt (e.g., 1 Cor 1:23) often use it to refer to
preaching the good news about Jesus but also to other kinds of proclamation
(e.g., Acts 15:21; Gal 5:11). (Chris Kugler, “Gospel,” in Lexham Theological Wordbook, ed. Douglas
Mangum et al. [Lexham Bible Reference Series; Bellingham, Wash.: Lexham Press,
2014], Logos Bible Software edition)