means to listen or watch out for new information.
to watch out for new trends.
I'll keep my ear to the ground and let you know what's happening at work.
If Mary had kept her ear to the ground, she wouldn’t have missed the opportunity for buying new house.
John had his ear to the ground when it came to news about the latest mobile phones.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.