On the tip of my tongue means almost remembered, and refusing to arrive. It is on the tip of my tongue.
Psychologists study it as a real and well-defined state, since people in it can often say the first letter. Trying harder makes it worse, and the word usually arrives once you stop.
1phraseon the tip of my tongueAlmost remembered, and refusing to arrive.
“His name was on the tip of my tongue for the whole of the journey.”
on the tip of my tongue is a phrase.
Practised in Idioms