N-, mag-
To repeat or continue an action (esp. w.r.t. harming s.o. or s.t.).
Yesterday I sprained by ankle. Then today I happened to do it again.
Bong kita magtilu-tiluan nimbak, magluhud kita.
When we have a contest at shooting a target, we can continue shooting (until we miss).
If you don't club it again, that snake will revive again.