How would you describe moving your head back in shock?
I.e. if something shocks you, you might move your head away from it, a bit like the gasping cat meme.
A friend has said 'shrink your neck', but I can't find any credible examples of that online.
Reeled or gasped in shock could be used, but I'm hoping to find a way to describe the specific action of moving the head back.
Any thoughts or advice will be much appreciated :)