Abbreviation question

I’m knitting a stuffed hippo for one of my friends, and at one point the pattern says to “p enc”. It also says to “k enc” on the next row…What does this mean?

I know the P stands for purl and the K stands for knit, but I just don’t know what that “enc” part means. Can someone please tell me? Thanks!

Encroachment stitches. See links.

Purl encroachment
http://hipknitism.com/library/techniques/p_enc.shtml

Knit encroachment
http://hipknitism.com/library/techniques/k_enc.shtml