by any stretch of the imagination meaning

• [American slang]
  as much as anyone could imagine; as much as is imaginable. (Often negative.)
    I don't see how anyone by any stretch of the imagination could fail to understand what my last sentence meant.

• stretch of the imagination:    [American slang]n. ...
• imagination:    Noun: imagination& ...
• at a stretch:    1. Continuously, w ...

Examples

1. basically, that means he isn't a winner or a leader by any stretch of the imagination
2. Not that Lovett is waterlogged by any stretch of the imagination.
3. This was a phenomenal quarter by any stretch of the imagination.
4. It was not a confrontation by any stretch of the imagination.
5. Coss is not a figurehead by any stretch of the imagination,