Just a moment is a polite request for a brief wait. Just a moment, I will fetch her.
It is the formal one of the family, and it is what a receptionist says. Said sharply to a person leaving, just a moment stops them where they stand.
1phrasejust a momentA polite request for a brief wait.
“Just a moment, I will see whether he is free.”
just a moment is a phrase.
Practised in Small Talk & Everyday Phrases