Meaning of the word "(as) deaf as a post" in English

What does "(as) deaf as a post" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

(as) deaf as a post

US /əz dɛf əz ə poʊst/
UK /əz dɛf əz ə pəʊst/
"(as) deaf as a post" picture

Idiom

completely deaf or unable to hear well

Example:
My grandmother is as deaf as a post, so you'll have to shout.
I tried to tell him, but he's as deaf as a post.