Which has broken down and, as a result, is no longer in working order. / Not properly maintained; neglected. / Ruined in character or strength.

past participle of break down

No longer in working order; broken. / Of a horse, no longer useful for work or riding due to illness or infirmity. / Ruined in character or strength.

(literally) A damaged piece of luggage / (US, Mafia, slang) A person who has fallen on hard times; a has-been

my car has broken down