luò mǎ
(lit.) to fall from a horse
(fig.) to suffer a setback
to come a cropper
to be sacked (e.g. for corruption)
Luò mǎ zhōu
Lok Ma Chau (place in Hong Kong)
zhòng jiàn luò mǎ
lit. to be struck by an arrow and fall from one's horse
to suffer a serious setback (idiom)