明察秋毫

1.discover the minutest detail in everything; able to see the fine down of birds in autumn -- very perspicacious; be able to penetrate deeply into all things; can see the tiniest objects; can see through a brick wall [through a millstone]; Everything is seen as clear as crystal (to sb.).; have eyes sharp enough to perceive a single hair of an animal's autumn coat; have eyes sharp enough to perceive an animal's autumn hair -- be perceptive of the minutest detail; see through a brick wall; sharp-sighted enough to perceive a bird's autumn down