ensañar
to be cruel
en-
to make, to put into
+
saña
fury, rage
Ensañar means to be cruel and can be thought of as en-0 (to make, to put into0) + saña1 (fury, rage1), literally meaning 'to put into a state of fury or rage'.
verb
- to be cruelTo be cruel or vicious towards someone or somethingNo debes ensañarte con los animales. // You shouldn't be cruel to animals.