Keep/have your ear to the ground
Definition 1 of 1
Pro Tip 1/3Metaphorical Origin
The phrase comes from the practice of putting one's ear to the ground to detect distant sounds, like approaching horses. 
As a journalist, she always has her ear to the ground for the latest news.
Pro Tip 2/3Business Acumen
Often used in a business context to suggest maintaining awareness of market trends or gossip. 
The best investors have their ear to the ground for any financial uncertainties.
Pro Tip 3/3Social Awareness
Can imply attentiveness to social changes or public opinion within a community. 
Politicians must keep their ear to the ground to understand voters' concerns.