Nobody can sock away $25,000 for an operation or $100,000 for end-of-life care; the very idea is crazy.
"knitted or woven covering for the foot, short stocking," early 14c., from Old English socc "slipper, light shoe," from Latin soccus "slipper, light low-heeled shoe," probably a variant of Greek sykchos, word for a kind of shoe, perhaps from Phrygian or another Asiatic language. The Latin word was borrowed generally in West Germanic, e.g. Middle Dutch socke, Dutch sok, Old High German soc, German Socke. To knock the socks off (someone) "beat thoroughly" is recorded from 1845, American English colloquial. Teen slang sock hop is c.1950, from notion of dancing without shoes.
"a blow, a hit with the fist," 1700, from or related to sock (v.1).
1700, "to beat, hit hard, pitch into," of uncertain origin. To sock it to (someone) first recorded 1877.
"to stash (money) away as savings," 1942, American English, from the notion of hiding one's money in a sock (see sock (n.1)).
To save or horde; put away as savings: Last year that group socked away $128 billion in savings bonds/ The American people socked away $3,200,000 in the year's second quarter
[perhaps fr the notion of concealing money in a sock; but sock, ''sew up and conceal,'' is attested fr the alteration of 1800s sock or sock down, ''pay, dispose of money'']
[fr the use of a sock as a container; one reference of 1698 indicates that sock meant ''pocket'' in underworld slang]