A mild, reversible cold injury in which the outer layers of skin freeze, causing numbness and paling but no permanent tissue damage; the earliest stage of frostbite.
If you stay outside without gloves, you risk getting frostnip on your fingertips.
frostnipverb
To cause mild superficial freezing injury (frostnip) to a part of the body.
The icy wind frostnipped my cheeks.
To experience mild superficial freezing injury.
His ears began to frostnip as the temperature dropped.