He was standing with his arms/hands behind his back.

[99bottles]

He was standing with his arms/hands behind his back.


Is there any difference?

 

[Tarheel]

Well, if your hands are behind your back your arms are going to have to be there too. So there's really no difference.

The next time I see something about somebody's arms behind his back will be the first time.

 

[Rover_KE]

When cops want to handcuff you they say 'Hands behind your back'.