E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Gimlet Eye (g hard).
A squint-eye; strictly speaking, “an eye that wanders obliquely,” jocosely called a “piercer.” (Welsh, çwim, a movement round; cwimlaw, to twist or move in a serpentine direction; Celtic, guimble.)
