A type of Sāmācārī (rules of conduct qua etiquette, formality and convention);
the Sāmācārī, in which the usage of the word tathākāra which is an endorsing expression (meaning 'what you say is correct') is to be made by the disciple in affirmative response to what is told (by the Guru (2) in the form of preaching).
....tahakkāro ya paḍissue...
(U 26.6)