(of a structure) having fallen down or given way

an abandoned building with a collapsed roof

(of a person) having fallen down and become unconscious

police officers rushed to the aid of the collapsed woman

having failed completely

the country's collapsed economy

compensation for workers in collapsed pension schemes

(of a structure) suddenly fall down or give way

the roof collapsed on top of me

(of a person) fall down and become unconscious as a result of illness or injury

he collapsed from loss of blood

fail suddenly and completely

the talks collapsed last week over territorial issues

fold or be foldable into a small space

some cots collapse down to fit into a holdall