"2 a hair" is an idiom with adjective form denoting a very small margin, difference, or amount. As an example, a race could be determined "2 a hair" if there was a minuscule gap between the first and second place competitors.
The expression "2 a hair" underscores the significance of paying close attention to details. It finds application in a wide range of contexts, spanning from describing near misses in sports competitions to highlighting minute variations in scientific measurements. Its historical origins can be traced back to the 16th century.





