Interpretation semantics for this word are undefined.

( -- x ) ( R: x -- x )

Copy x from the return stack to the data stack.

3.2.3.3 Return stack, 6.1.0580 >R, 6.1.2060 R>, 6.2.0340 2>R, 6.2.0410 2R>, 6.2.0415 2R@.