折り返し

What does 折り返し mean in English?

1. by return; (call or write back) without delay(adv)
2. lapel; cuff; turn-up; flap(n)
3. going back; returning; turn (marathon, swimming, etc.)(n)
4. chorus; refrain(n)
5. shuttle service(n)
6. aliasing (in imaging)(n)
7. back-to-back; BTB(n, adj-no)
8. wrapping (text on computer screen); wrap(n)