squirrel away
Verb
Meaning
save up as for future use
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Examples
I squirrel away sealed greeting cards that people give me so I can open them later when I'm having a bad day.
Once I'd reached the point where I could squirrel away more than 30 digits a minute in memory palaces, I still only sporadically used the techniques to memorize the phone numbers of people I actually wanted to call. I found it was just too simple to punch them into my cell phone.