When someone says that someone doesn't blink. It means they don't think twice or they won't hesitate about committing a certain action. It most commonly refers to murder but it could be used for other things as well like stealing or firing someone. Things most people may feel guilt or uncomfortable with but doesn't phase these people in that particular circumstance.

The term mostly likely came from how people squint at the sight of bright gunfire after while you get use to it and the there's no need to squint or blink.
by LTD January 30, 2019
Get the They Don't Blink mug.
Don't blink, Blink and you're dead, don't blink. Don't turn your back, don't look away and don't blink. When you see the wheeping angels then you'll know. Don't let them inside the blue box.
by Rose's daughter February 10, 2010
Get the Don't blink mug.