keep half an eye on (someone or something)

keep half an eye on (someone or something)

To watch someone or something intermittently or half-heartedly while something else is happening. Unfortunately, I don't remember what that list said because I kept half an eye on the TV while mom was trying to show it to me.

See also: eye, half, keep, on

Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.