miss by a mile
fail to do something by a great amount, to fail to hit something by a great distance
The soccer player seemed almost certain to score a goal but actually he missed by a mile.
Precautions while using Nail Paint
Wash your hands in the water and massage the skin around your nails
Gently rub your fingers with an old sponge or cloth. To start, if you are using colour, apply a good base coat. Keep in mind that dark polishes stand out, as does red and metallic polishes show up mistakes easily. Solid colours and chunky glitter are forgiving. It is recommended that you use a clear nail strengthening varnish, for a couple of reasons.