to defend; to protect; to keep / to guarantee; to ensure / civil administration unit in the baojia 保甲[bao3 jia3] system (old)
保
=
亻
+
呆
:
Mnemonic symbol: a safe.
In the aorta (ao3), the fool (呆) and Rosa Luxemburg (亻) unite their forces to protect (保) the world and try to lock Beelzebub (b) in a safe (保).