The phrase "accumulation years" refers to the period in a person's life when they are working, saving money, and building up assets or wealth for the future, typically before retirement. Full definition
While these may also be wealth accumulation years, insurance can be an integral part of protecting what you're building. (us.hsbc.com)
But I totally agree that they shouldn't be considered an extension of your emergency fund especially in the beginning accumulation years when tapping them probably means a stiff penalty. (lifeandmyfinances.com)
It's not a good idea to convert capital gains that you can defer for a long time into current income during asset accumulation years. (canadiancapitalist.com)