down to a gnat's eyebrow

down to a gnat's eyebrow

In consideration of the most minute detail. I have planned this itinerary down to a gnat's eyebrow, so we are not deviating from it, even for a minute!
See also: down, eyebrow

down to a gnat 's eyebrow

Fig. down to the smallest detail. He described what the thief was wearing down to a gnat's eyebrow. No use trying to sneak anything out of the refrigerator. Mom knows what's in there, down to a gnat's eyebrow.
See also: down, eyebrow, gnat
References in periodicals archive ?
As a result, American direct marketers can test down to a gnat's eyebrow and cash in big time on the rollouts.