It means he was very very bold.
Interested in Language
"This guy is as bold as bold could be," said star Michael Keaton, referring to director and co-writer Alejandro Gonzalez Inarritu.
What does it mean in red?
as bold as, the "as" describes the bold, "adjective"?
as bold could be, it describes he will be bold very much?
"As bold as bold could be" means "As bold as bold gets (becomes)". However bold he is, men don't get any bolder.
May I simply take 'as (adjective) as (adjective) could be' to mean 'most (adjective)'?
Don't make sense?
MikeNewYork was as bold as love in his girlfriend.
Does it make sense? Or correct?