at the tip of one's tongue
at the tip of one's tongue or on the tip of one's tongue {adv. phr.}
{informal}
1. Almost spoken; at the point of being said.
It was at the tip of my tongue to tell him, when the phone rang.
John had a rude answer on the tip of his tongue, but he remembered his manners just in time.
2. Almost remembered; at the point where one can almost say it but cannot because it is forgotten.
I have his name on the tip of my tongue.
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Source: A Dictionary of American Idioms
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