Eor

I am working on the Charlie Vest(Knit One Crochet Too).
I am at the Armhole Shaping part, it tells me:
BO 39 sts at beg of next RS row,
dec 1 st at same edge eor 8 times
75 sts rem
Mark ros for end of shaping.

I can handle the BO part but the dec 1 line is confusing me. It says at same edge but then say eor!
Once again, thanks for help.
Marilynn

Usually it’s end of row, but this might mean every other row.