noun, noun or participle which takes 'suru', intransitive verb
downfall; ruin; falling into straitened circumstances
Describes a decline from prosperity to poverty or ruin, often used in literary or formal contexts. Can be used as a noun or with する to mean 'to fall into ruin'.
彼は事業に失敗して零落した。
He failed in business and fell into ruin.
零
From a state of ruin, he plans a comeback.