Meaning of the word "be (as) dead as a dodo" in English

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

be (as) dead as a dodo

US /bi əz dɛd əz ə ˈdoʊdoʊ/
UK /bi əz dɛd əz ə ˈdoʊdoʊ/
"be (as) dead as a dodo" picture

Idiom

to be completely dead, extinct, or no longer in existence or use

Example:
That old technology is as dead as a dodo.
The idea of sending letters by post for urgent messages is as dead as a dodo.