That zone is a fault line, a crease in the planet floor between the North American plate and the Continental plate.
If a crease has been made by the thread running through it, take it out and put in a new one.
I punched a hole with a pin in the crease of the envelope at each end.
On woolen goods or material that does not crease easily it is necessary to baste the first fold.
The other Etonian is already within a couple of yards of the crease.
Lay on a pan or perforated sheet, then crease marked squares half through the dough with a spatula or the back of a knife.
With a crease in his lips which now were dry no longer, he looked at Cassy.
On the garment side make a crease half an inch wide, from the hemming, on the four sides.
crease and fold on these diagonals, extending the triangle inward.
Follow the same directions in folding the crease that runs from the lower left edge to centre of square.
A line made by folding or wrinkling, as in the skin.