a failure (of an engine, machine etc)

nervous collapse

break up

end of relationship

(an instance of) collapsing

downfall, breakdown

to be, begin to be, decaying

breaking down, collapse

the breaking up or ending (of a marriage, partnership, formal meeting etc)

separation, rupture

the decay of a part of the body because the supply of blood to it has been stopped

decay

a destroyed state; a state of financial collapse; a building that has been destroyed

situation of devastation