How do I stop my knitting from fraying?

Why is it called frogging in knitting?

Tink is knit spelled backwards, and it refers to undoing one stitch at a time. … My knitting colleagues know that I prefer to frog, meaning I take the knitting off the needles and pull the yarn, undoing rows of stitches at a time. Frogging gets its name from “Rip it, rip it,” which sounds like a frog’s croak.

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