could (do something) with (one's) eyes shut(redirected from could with their eyes shut)
could (do something) with (one's) eyes shut
Could do something with very little or no difficulty, or complete or accomplish something in a relaxed, carefree, or effortless manner. It took me a little while to get used to this job, but now I could do it with my eyes shut! You should ask Johnny for help—he could do this level of math with his eyes shut.