eyes in the back of one's head, have

have eyes in the back of (one's) head

To be or seem to be able to detect what is going on all around one, even beyond one's field of vision. My mom always seems to know when we've done something we shouldn't have. She has eyes in the back of her head! Look, just be very careful not to do personal things during the work day—the boss has eyes in the back of his head.
See also: back, eye, have, head, of

eyes in the back of one's head, have

Be more aware of what is happening than is generally realized. For example, Even when he's away he always knows what the staff are doing-he has eyes in the back of his head , or With such hostile colleagues she needs to have eyes in the back of her head. [Mid-1500s]
See also: back, eye, have, of