If a word is on the tip of the tongue, you want to say it but can’t remember.

For example:

I know the answer to this question. No, no, don’t tell me. Oh, it’s on the tip of my tongue.

What is her name? It’s on the tip of my tongue. Joan. Joan Simpson. That’s it!

It was on the tip of my tongue to say, ‘I’d rather have dinner with a snake.’

Tradução: na ponta da língua.