BrE /rɪˈbel/ ; NAmE /rɪˈbel/ (rebelling, rebelled) [intransitive] rebel (against somebody/something) to fight against or refuse to obey an authority, for example a government, a system, your parents, etc. He later rebelled against his strict religious upbringing. Most teenagers find something to rebel against. In 1215 the barons rebelled against the king. The colonies rebelled and declared their independence.