a country mile meaning

[American slang]
Rur. a great distance.
  The batter knocked that ball a country mile.
  I had to walk a country mile to the next gas station.

• by a mile:    [American idiom]by ...
• mile:    Noun: mile &n ...
• country:    Noun: country  ...

Examples

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1. The other swung his club and whacked it a country mile.
2. The article still fails WP : MUSIC by a country mile.
3. They are now not the best by a country mile.
4. They're a country mile off their earlier projections,"
5. I would certainly prefer local ownership by a country mile,