Sock away
Definition 1 of 1
Pro Tip 1/3Informal Usage
Used in casual conversation rather than formal or business settings. 
I'm trying to sock away enough for a new car.
Pro Tip 2/3Positive Connotation
Implies prudence and foresight, often evoking a sense of smart planning. 
She's good at managing her expenses to sock away a bit.
Pro Tip 3/3Long-Term Saving
Suggests saving money over a period for significant future needs or wants. 
They plan to sock away funds for their retirement.