ridicule
詬 centers on using words to attack someone's dignity: ridicule, insult, or shame.
詬 combines 言 (speech) with 后, which likely contributes the sound and may relate to the idea of verbal attack or shame. The exact historical development of the right component is uncertain.
Words 言 from a ruler 后 can ridicule and shame a subject. Picture a haughty empress using cutting remarks to humiliate someone.
For コウ, imagine a court jester ridiculing the king with a loud 'KO-UGH!' cough: the sound 'KO-UGH' cues コウ while the jester mocks the ruler.