Meaning of the word "arm in arm" in English

What does "arm in arm" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

arm in arm

US /ɑːrm ɪn ɑːrm/
UK /ɑːm ɪn ɑːm/
"arm in arm" picture

Idiom

with the arm of one person linked through the arm of another

Example:
The couple walked arm in arm along the beach.
They left the theater arm in arm.