a solid idea?

[hooootdog]

when i read i sometimes come cross "...have a solid idea", i just wonder what idea can be a solid idea?

thanks

 

[emsr2d2]

First, please click on Edit Post and make sure your post follows these rules of written English:

- Start every sentence with a capital letter.
- End every sentence with one appropriate punctuation mark.
- Capitalise the word "I" (first person singular).

 

[Tdol]

It is a reasonably clear and reliable idea.