gnat's ass
Tiniest possible margin
A gnat's ass is something vanishingly small—the tiniest possible unit of measurement.
Usually appears in expressions about precision or insignificance: Move it a gnat's ass to the left, I don't give a gnat's ass what he thinks.
The phrase emphasizes how little something matters or how fine an adjustment needs to be.
- trifleInsignificant matter or thing
- tinker's damnWorthless amount or thing
- couldn't care lessComplete absence of concern
- drop in the bucketInsignificant portion of total
- hill of beansTrivial, worthless amount
nanometer · splitting hairs · fine tooth comb · pinpoint · pittance · atom · speck · wisp · microbe · iota · hair's breadth · grain · mote · fine point · nitpicking · crumb · smidgen · scrap
precision/tolerance
gnat's assballpark
Sports venue or estimate
rough estimate · order of magnitude · give or take · approximately · loosely