amigar
to befriend
amigo
friend
+
-ar
verb suffix
Amigar means to befriend and can be thought of as amigo0 + -ar1, where -ar1 indicates it's a verb1 meaning 'to make someone a friend0'.
verb
- to befriendTo become friends or to reconcileDespués de la pelea, decidieron amigar y olvidar lo sucedido. // After the fight, they decided to reconcile and forget what happened.