Meaning of the word "by a whisker" in English

What does "by a whisker" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

by a whisker

US /baɪ ə ˈwɪskər/
UK /baɪ ə ˈwɪskər/

Idiom

by a very small amount; narrowly

Example:
He won the race by a whisker.
We missed the train by a whisker.