To fold into ridges.

To fold or pleat.

1. To become folded; SYN. fold up.
2. To bend or lay so that one part covers the other; SYN. fold up, turn up.
3. To incorporate a food ingredient into a mixture by repeated overturnings without stirring or beating.
4. To intertwine.

1. Fold; especially; to arrange in pleats
2. Plait

1. To apply oneself diligently
2. To travel a route regularly; SYN. run.
3. To use diligently
4. To wield vigorously

1. To become puckered; SYN. ruck, ruck up.
2. To gather something into small wrinkles or folds; SYN. draw, rumple, cockle, crumple, knit.

ETYM Obs. and r.
1. To contract one's lips into a rounded shape.
2. To gather or contract into wrinkles or folds; pucker; SYN. wrinkle.

To weave diagonal lines into; of textiles.