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What does "knocks it out of the park" means?

example : "All should read this book as it knocks it out of the park"

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closed as off-topic by terdon, choster, Kristina Lopez, Matt E. Эллен, MrHen Jan 22 '14 at 16:12

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions that can be answered using commonly-available references are off-topic. A list of these references can be found here: List of general references" – terdon, choster, Kristina Lopez, Matt E. Эллен, MrHen
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Welcome to the site. This question has already been asked on the ELL site. It also could have been answered by a quick google search. – Doc Jan 21 '14 at 19:53
Google is not general reference. – phenry Jan 27 '14 at 23:50

To "knock it out of the park" is a reference to a homerun in baseball - where the batter hits the ball clear out of the ball-park. It means to do extremely well. See this wikipedia page for this and other baseball related idioms.

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oh, i see, in allusion to a baseball action. i didn't know as it is not a popular sport here in our country. thanks for that sir. – Vance Jan 21 '14 at 19:59

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