have an ear to the ground
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have 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 have an ear to the ground." B: "Please let me know if you hear anything." I know Kim has her ear to the ground in case word gets out about the promotion.
have (or keep) an ear to the groundbe well informed about events and trends.
The idea behind this phrase is that by putting your ear against the ground you would be able to hear approaching footsteps.