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Related to sock away: pull socks up
To save or reserve something, especially money, for future use. In this usage, a noun or pronoun can be used between "sock" and "away." If you can sock away even $100 each month, it will go a long way toward our vacation at the end of the year. We've been socking little bits away for years in order to put down a deposit on a home.
sock something away
to place something, such as money, into reserve; to store something in a secure place. I try to sock a little money away each month for my vacation. I will sock away some money.
Put money in a safe place for future use, as in I've got about $2,000 socked away for a new car. This usage presumably alludes to putting one's savings in a sock. [Colloquial; first half of 1900s]
To put something valuable in a safe place for future use: He socked away some gold in a mattress in case the bank was robbed. While the rest of us have been blowing our salaries on electronic gadgets, she has been quietly socking hers away.