see with half an eye
Notice the obvious, tell at a glance, as in I could see with half an eye that he was sleeping through the entire concert. This hyperbolic expression, which presumably alludes to an eye that is only half-open, was first recorded in 1579.
WHO SAID IT: A QUIZ ON PRESIDENTIAL WIT AND WISDOM
Question 1 of 9
Words nearby see with half an eye
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.