noun, noun or participle which takes 'suru', intransitive verb
retirement announcement; declaration of retirement
Used for formally or publicly announcing one's retirement, especially in sports, politics, or entertainment. Can be used as a noun or with する to mean 'to announce one's retirement'.
彼は突然引退宣言をした。
He suddenly announced his retirement.
引退宣言の記者会見
A press conference for the retirement announcement was held.