meaning: separate, leave
離反 == rihan == (noun) estrangement, alienation, disaffection
Right radical is a radical form of
'bird'. Left radical is a character found only in Chinese, meaning 'bright/glossy/oppose'.
Here it is used phonetically to express a type of brightly colored bird, a type of oriole.
It can still mean 'oriole' in Chinese; its Japanese meanings may be the result of borrowing.
Henshall suggests taking the top element in the left radical as a 'full box' and its 'lid',
the bottom element in the left radical as an 'odd' version of 'insect' (虫), and as a mnemonic:
'Separate bird from lidded box full of odd insects.'