verb

break or cause to break into fragments.

Lough Erne fragmented into a series of lakes

break up,break,break into pieces,crack open/apart,shatter,splinter,fracture,burst apart,explode,blow apart,implode,disintegrate,come to pieces,fall to pieces,fall apart,collapse,break down,tumble down,smash,smash to smithereens,bust,spall,shiver