Meaning of the word "know a hawk from a handsaw" in English

What does "know a hawk from a handsaw" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

know a hawk from a handsaw

US /noʊ ə hɔk frəm ə ˈhændˌsɔ/
UK /nəʊ ə hɔk frəm ə ˈhændˌsɔː/
"know a hawk from a handsaw" picture

Idiom

to be able to distinguish between two very different things; to have common sense

Example:
He may seem a bit eccentric, but he certainly knows a hawk from a handsaw.
Even a child should know a hawk from a handsaw when it comes to basic safety.