reverse side; back
Literal meaning: the reverse or back side of something. Less common than the idiomatic sense.
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.
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.