by a hair/whisker

by a hair/whisker

Very narrowly, by a very small distance or amount. For example, “He missed sideswiping that car by a hair,” or “That ball was in, but just by a whisker.” Both versions of this cliché allude to the fineness of a single hair. The first, also put as by a hairbreadth, dates from the fourteenth century, whereas the second originated in early twentieth-century America.
See also: by, hair, whisker
The Dictionary of Clichés by Christine Ammer
See also:
  • within
  • within a whisker of
  • within a whisker of (something)
  • within a whisker of something
  • put some distance between
  • put some distance between (someone or something)
  • put some distance between someone and someone/something
  • into the distance
  • in striking distance (of someone or something)
  • pace out