have an ear to the ground

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Related to have an ear to the ground: under the wire, in the good graces of

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.
See also: ear, ground, have

have (or keep) an ear to the ground

be 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.
See also: ear, ground, have

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

ear to the ground, to have/keep an

To be well informed. The allusion here, one writer conjectures, is to the days of cowboys and Indians, when one literally put one’s ear to the ground in order to hear the sound of horses miles away. An Americanism dating from the late nineteenth century, the term was a cliché by the time Stanley Walker poked fun at it (and two others) in The Uncanny Knacks of Mr. Doherty (1941): “He had his ear to the ground and his eye on the ball while they were sitting on the fence.”
See also: ear, have, keep