Meaning of upstander in English:

upstander

Pronunciation /ˈʌpstandə/

noun

US
  • A person who speaks or acts in support of an individual or cause, particularly someone who intervenes on behalf of a person being attacked or bullied.

    • ‘encourage your daughter to be an upstander, not a bystander’

Origin

Mid 17th century (in the sense ‘a person who stands’): the current sense was coined in 2002 by the Irish American diplomat Samantha Power after bystander, probably from stand up for.