For someone (actor & inst) to bump or scrape someone or something held (theme i-) on a protruding object (loc ref) as one moves forward, as to scrape a load on a bank, to bump a child's body on a protruding object.
Adim itu'dud nan talak ti mapa''i.
Don't scrape the truck (i.e., in driving it) or it will be destroyed.