Definition of libber in English:

libber

noun

informal
  • [usually with modifier] A member or advocate of a movement calling for the liberation of people or animals.

    ‘a women's libber’
    • ‘Trade libbers have us swallowing medicine for a disease we don't have’
    • ‘The animal libbers annoy me who get involved in this.’
    • ‘Where are all the protests against China from the Greenies and animal libbers?’

Pronunciation:

libber

/ˈlɪbə/