kào
lean on
Original meaning:
conflict
Phonosemantic compound. 非 represents the meaning and 告 represents the sound. Based on the original meaning "conflict". The meaning later shifted to "lean against".
Evolution

Seal script
Shuowen (~100 AD)Regular script
ModernDefinitions
kào
lean on, trust, depend on; near; to lean against or on; to stand by the side of; to come near to; to depend on; to trust; to fuck (vulgar); traditional military costume drama where the performers wear armor (old)
Sources