The term 'split asunder' is a phrase that means to divide or separate something into two parts. The crossword solutions for this term are 'CLEAVE' (6 letters), 'RIVE' (4 letters), and 'RIVEN' (5 letters). CLEAVE is a verb meaning to split or divide something with force, while RIVE is a verb meaning to tear apart or split something. RIVEN is an adjective meaning torn apart or split. All three words can be used to describe the act of splitting something asunder.