drop beneath the/(one's) radar(redirected from drop beneath their radar)
drop beneath the/(one's) radar
To go unnoticed or undetected (by one). With so many different amendments to the bill being made, some appropriations dropped beneath the radar. As the manager of this office, it's inexcusable that you allowed embezzlement by an employee to drop beneath your radar.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.