Noun, Noun which may take the genitive case particle 'no'
getting rich quick; making a killing; making a fortune at a single stroke
Yojijukugo (four character compound)
多くの人が一攫千金を夢見て宝くじを買う。Many people buy lottery tickets with the dream of immediately becoming wealthy.
Also written 一獲千金【いっかくせんきん】