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Definition of Hear the grass grow
1. Verb. (idiomatic) To have an extremely sensitive sense of hearing. ¹
2. Verb. (idiomatic) To hear very well due to being in an exceptionally quiet environment. ¹
3. Verb. (idiomatic) To be very aware or discerning; to pay attention to every small detail. ¹
¹ Source: wiktionary.com