noun
mass retirement
Often refers to the large-scale retirement of Japanese baby boomers (団塊の世代) around 2007–2009, but can be used for any large wave of retirements.
団塊の世代の大量退職が企業に大きな影響を与えた。
The mass retirement of the baby boomer generation had a major impact on companies.
大量退職による人手不足が深刻化している。
Labor shortages are becoming more serious due to mass retirements.
Compound of 大量 (large quantity) and 退職 (retirement).