Over and back fold: Also called Accordion fold, Zigzag fold.

之字折：亦称风琴折，扇形折。

youdao

The quickest way to double your money is to fold it over and put it back in your pocket.

让钱增多最快地方式就是别花钱。

youdao

Cowboy's opinion: The quickest way to double your money is to fold it over and put it back in your pocket.

牛仔的观点：让你的钱增加一倍的最快的方法就是把它们对折以后再放回兜里。

youdao

Children of the current generation will be poorer for it if they never get to linger over a vast paper map and then try in vain to fold it back into its original shape.

WSJ: Lost in Our Maps: A History of Cartographic Catastrophes