ma-, mapa-
To do something unintentionally or spontaneously, without a plan;
to end up joining something without previous intentions.
Anda ka rin ay plano ang mamakal ta sapatos,
nasobō ra tenged masinlo.
I didn't have a plan to buy shoes, I just
did
it because
they were nice looking.
Nabagat ta kasoay na tang logodo, asta yo
napasobō.
My brother happened to meet up with his enemy, and I also
ended
up
joining
in (i.e. in defending him).