For someone (agent maN-) to break a linear object (patient -on) in two with or without the use of a suitable instrument (inst i-, paN-), as to break a stick, a cane, a bean pod.
mamūtad; pamūtad
For someone or something (actor -um- & inst) to accidentally break a linear object (patient -on) in two, as people who break a bridge by their weight when crossing, a wind which breaks a tree in a storm.