An example of defend is to stand up for a person who is being picked on by bullies.
Defended his friend's behavior.
Defend one's conduct.
Origin of defend
- Middle English defenden from Old French defendre from Latin dēfendere to ward off gwhen- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
- Middle English defenden, from Old French deffendre (Modern: défendre), from Latin dēfendō (“to ward off”).