punish, fault, blame
讁 centers on assigning fault and its consequences: blaming someone for a wrongdoing and punishing them for it.
讁 combines 言 (speech) with 適, which likely contributes the sound and may relate to assigning or directing blame. The exact historical development is uncertain.
Words (言) that are suitable (適) for pointing out a fault: blame and punishment follow.
For タク, imagine a tack being used to pin a blame note to a bulletin board: tack -> タク, and the words (言) assign fault.