To ring a bell is to sound faintly familiar without quite coming back. The name rings a bell.
It describes half a memory, which is exactly the state it names. It is nearly always used of names and places rather than of facts.
1phrasering a bellTo sound faintly familiar without quite coming back.
“The street name does ring a bell but I could not tell you why.”
ring a bell is a phrase.
Practised in Idioms