Meaning of the word "every dog is a lion at home" in English

What does "every dog is a lion at home" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

every dog is a lion at home

US /ˈɛvri dɔɡ ɪz ə ˈlaɪən æt hoʊm/
UK /ˈɛvri dɒɡ ɪz ə ˈlaɪən æt həʊm/
"every dog is a lion at home" picture

Idiom

everyone feels brave or powerful in their own familiar environment or territory

Example:
He talks big in his own office, but every dog is a lion at home.
Don't be intimidated by his threats; every dog is a lion at home.