ear to the ground, have one's

ear to the ground, have one's

Also, keep one's ear to the ground. Be or remain well informed; be on the watch for new trends and information. For example, She knew she'd succeed as a reporter if she kept her ear to the ground. This graphic expression probably alludes to listening for distant hoofbeats by putting one's ear close to the ground. [Late 1800s]
See also: ear, have