Rakkha (adj.) ( -- ˚) [fr. base rakkh] guarding or to be guarded; -- (a) act.: dhamma˚ guardian of righteousness or truth Miln 344. -- (b) pass.: in cpd. dū˚, v. l. du˚ 

hard to guard DhA i.295. ˚kathā, s. l. rukkha -- ˚, warding talk ThA 1, in Brethren, 185, cp. note 416.