It's called "frogging" because you rip-it, rip-it, rip-it out. Then there's tinking, which is just knitting in reverse! (Technically that would be gnittink, I suppose, but let's just go with it.)
I did a kind of iffy job of explaining using dental floss as a lifeline. Interweave explains it better here.
And we're off! Use the hashtag #makegoodstashdown (no year!) to enter.
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