For someone, or something (actor -um- & inst) to scrape or bump something (theme i-) carried on something (loc ref), as to bump a load being carried on a rock jutting out of a bank along a trail.
Adim adukkāyon nan āyiwmu ti mipa''u' hinan pangdaw.
Don't make your wood long because it will be bumped by a projecting step (of a stone wall).