Wikipedia
Christmas club
The Christmas club is a savings program that was first offered by various banks in the United States during the Great Depression. The concept is that bank customers deposit a set amount of money each week into a special savings account, and receive the money back at the end of the year for Christmas shopping.
Usage examples of "christmas club".
Come, Mortgage, come Christmas Club, come-- Lilymary turned her face away.
They had their bottles of cheap spirits, for which they had paid into the publican's Christmas club.
She saved a little each week into a Christmas Club for 'rainy days'.