Fighting back against authority or rules; refusing to obey or accept something.
From Latin 'rebellare' (to war against), combining 're-' (against) and 'bellare' (to wage war), related to 'bellum' (war). Used in English since the 1300s.
Teenagers rebelling against parents is so universal that psychologists think it's hardwired—it actually helped humans survive because it made young people more independent, though it felt annoying to parents throughout history!
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