Idiom Definition:
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"to have your ear to the ground"
"to keep your ear to the ground"
describes the process of remaining vigilant in the acquisition of information in order to discover hidden, secret or extra information
Synonyms:
alert, astute, awake, aware, conscious, discerning, intelligent, intuitive, knowing, knowledgeable, listen, listening, observant, penetrating, savvy, sensitive, sharp, shrewd, smart