Nothing was written on the back of the card.
purl stitch
Knitting term; the reverse side of a knitted fabric, or the purl stitch itself.
This sweater has a design where the purl side is on the outside.
His kindness ended up backfiring.
You knit purl stitches to create the pattern.
裏 is the general word for the 'back/reverse side' of anything, while 裏目 is a narrower term often tied to specific contexts like knitting or the idiom 裏目に出る.
表 means the front or obverse side, the direct opposite of 裏目's literal sense of the back or reverse side.
In knitting, 表目 (knit stitch) is the opposite of 裏目 (purl stitch).
make a mistake in mahjong; mess up a meld choice
Compound of 裏 (ura, 'back, reverse') and 目 (me, 'eye, stitch, grain'). The knitting sense comes from the appearance of the purl stitch as the reverse side of the fabric.