Turn the Mind was an instruction given as part of our pushing hands practise.
When pushing hands, most will move backward onto their rear leg and turn their waist to yield. Whilst this has the effect of taking the body away from the oncoming force it does not completely yield to.
The mind needs to turn so that you are not leaving a part of yourself behind which will cause you to somehow be stuck. Not turning the mind means that the oncoming force will find that part of you and all will be lost.
So sink, relax, shift, turn the waist, turn the mind.
Make it part of pushing hands. Make it part of your form.