Meaning of the word "nothing so bold as a blind mare" in English

What does "nothing so bold as a blind mare" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

nothing so bold as a blind mare

US /ˈnʌθ.ɪŋ soʊ ˌboʊld æz ə ˈblaɪnd ˌmer/
"nothing so bold as a blind mare" picture
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