I've never heard that term specifically, but it probably means to knit two into that one stitch so you would have one stitch coming from it for each side of the V neck.
If it gives a stitch count for the next row, you could double check.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry