Sometimes it is necessary to temporarily hide values on the datastack. The dip combinators invoke the quotation at the top of the stack, hiding some number of values underneath:

dip ( x quot -- x )

2dip ( x y quot -- x y )

3dip ( x y z quot -- x y z )

4dip ( w x y z quot -- w x y z )

The keep combinators invoke a quotation and restore some number of values to the top of the stack when it completes:

keep ( x quot -- x )

2keep ( x y quot -- x y )

3keep ( x y z quot -- x y z )