whipcord

[gemini]

a twist of very fine whipcord

What is it?

 

[Atchan]

a twist of very fine whipcord

What is it?

Twist means "to turn something, especially repeatedly" when you twist something.
While whipcord means a rope. (a piece of) strong, thick string made of long twisted threads.

Is that understandable?

 

[gemini]

Yes, thank you, but what it is use for?

 

[Atchan]

Yes, thank you, but what it is use for?

Really I don't know what it use to and this is the first time that I see this sentence.

 

[gemini]

Maybe a roll of bandage?

or string of a whip?

 

[Atchan]

Maybe a roll of bandage?

I don't think so. I hope other members enter this thread and answer about this question.
Yes, its a string of a whip. Nice you did it.

 

[Rover_KE]

It's also used for making trousers:

GANT Whip Cord Jeans JEANS AND TROUSERS Gant Mens & Womens Clothing and Accessories Online

Rover