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To put something into storage for use at a later date. An allusion to preserving foods, especially meats, by curing them with salt. A noun or pronoun can be used between "salt" and "away." Over the years I've taken to salting away lots of bottled water and nonperishable foods, in case of an emergency. You'd be wise to salt some of your paycheck away each month.
salt something away
1. Lit. to store and preserve a foodstuff by salting it. The farmer's wife salted a lot of fish and hams away for the winter. She salted away a lot of food.
2. Fig. to store something; to place something in reserve. I need to salt some money away for my retirement. I will salt away some money for emergencies.
Also, salt down. Keep in reserve, store, save, as in He salted away most of his earnings in a bank account. This idiom alludes to using salt as a food preservative. [Mid-1800s]
To save or store something for future use: I salted away money from my summer job to pay for college. I bought 20 packs of paper towels that were on sale, and I salted them away.