keep your ear to the ground

keep an/(one's) ear to the ground

To listen for any indication of what is happening or will happen. A: "I'm not sure what's going to happen with this merger, so I'm keeping an ear to the ground." B: "Please let me know if you hear anything." I know Kim is keeping her ear to the ground in case word gets out about the promotion.
See also: ear, ground, keep
Farlex Dictionary of Idioms.

keep your ear to the ground

or

have your ear to the ground

mainly BRITISH
If you keep your ear to the ground or have your ear to the ground, you make an effort to be aware of what is happening around you. Keep your ear to the ground. Know who is coming and who is going: a new vacancy could be an opportunity for you. Paul had his ear to the ground and always knew about future concerts before anyone else Note: In films, Native Americans used to be shown tracking people or animals by listening carefully to the ground for the sound of their footsteps.
See also: ear, ground, keep
Collins COBUILD Idioms Dictionary, 3rd ed.

keep/have an/your ear (close) to the ˈground

(try to) be well-informed about what is or will be happening: Jane keeps her ear pretty close to the ground and can usually tell you what the mood of the staff is.
See also: ear, ground, have, keep
Farlex Partner Idioms Dictionary
See also:
  • keep an/(one's) ear to the ground
  • keep an ear to the ground
  • keep an/(one's) ear close to the ground
  • have an/(one's) ear close to the ground
  • have an/(one's) ear to the ground
  • ear to the ground, have one's
  • have an ear to the ground
  • keep/have an/your ear to the ground
  • What’s the deal?
  • what's the deal
References in periodicals archive
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I am speaking regularly to dozens of agents because you always want to keep your ear to the ground where these things are concerned.
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CALL MY CAPRICORN LINE TO HEAR MORE 09044 700 730 AS one door closes, another one will open, so keep your ear to the ground. Don't take any unnecessary risks.
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Social links also lead you to a better career, so keep your ear to the ground. Call now for insight.
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Keep your ear to the ground, whether it's subscribing to the state fish and wildlife department's newsletter, or simply asking every cop who comes into the shop, "Hey, what's new with your department on the gun front?"
Be aware of hunting season changes
Please keep your ear to the ground and attend one of the Supply Enlisted Road Shows this year.
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Keep Your Ear to the Ground. The days of highly publicized property offerings with three rounds of competitive bidding and 5 days of due diligence are long gone.
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Keep your ear to the ground for opportunities, for example some businesses, such as the engineering sector, often win a major contract creating an artificial peak in their business.
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But you can hear a lot of great music if you keep your ear to the ground."
It's Jazz all night