Where does “tuntun” come from?

tuntun (Malay) comes from Javanese ꦠꦸꦤ꧀ꦠꦸꦤ꧀, from Old Javanese tuntun, from Proto-Malayo-Polynesian *tuntun.

tuntun (Malay): to guide, to lead by holding one's hand, with a rope etc