gnat's en · NOUN
Etymology
Shortened from various (often vulgar) phrases for parts of the anatomy of a gnat, a very tiny insect. These include gnat's arse/gnat's ass, gnat's chuff, gnat's prick, and gnat's whisker.
Meanings
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(slang) A very tiny thing or distance; a whit; a jot; something of no consequence.
The building project will be a gnat's away from being finished.
2013, Catherine Robertson, The Misplaced Affections of Charlotte Fforbes: