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Related to hair's breadth: hairbreadth
A very small amount or short length. After wandering around the forest for an hour thinking we were lost, it turned out that we were only a hair's breadth away from our campsite. The seal is air-tight—there's not a hair's breadth between the door and the frame.
a hair's breadth
1. You use a hair's breadth to talk about the smallest possible amount or degree of something. The town suffered heavy bombing, coming within a hair's breadth of being destroyed altogether. He missed the two-minute barrier by a hair's breadth, finishing in 2.00.04 and setting a new British record. The situation was a hair's breadth away from being comical.
2. You use a hair's breadth to talk about the smallest possible distance. A stone flew past him, missing him by a hair's breadth. His head was a hair's breadth away from the car roof.
a hair's breadtha very small amount or margin.
a ˈhair’s breadtha very small distance or amount: He escaped death by a hair’s breadth. If the other car had been going any faster, he would certainly have been killed. ♢ She was within a hair’s breadth of winning.
Breadth means width.