Origin: Germanic Old English prefix
Belong has 9 different meanings across 2 categories:
be a member, adherent, inhabitant, etc. (of a group, organization, or place)
"They belong to the same political party"
To have its proper place.
"The misplaced painting finally belonged on the wall above the fireplace."
To be accepted in a group.
"After joining the hiking club, she quickly felt that her energetic personality made her belong to the team."
In plain English: To belong means to be part of a group, place, or family where you fit in and feel accepted.
"This book belongs on my desk, not in your bag."
Of, belonging to.
"The car keys found in the glovebox belonged to my brother."
The word "belong" comes from Middle English be- combined with longen, which originally meant to be fitting or suitable. Over time, this phrase evolved in meaning and entered modern English as the verb we use today for things that are part of a group or place.