on the tip of tongue
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*on the tip of one's tongue
Fig. [of a thought or idea] about to be said or almost remembered. (*Typically: be ~; have something ~.) I have his name right on the tip of my tongue. I'll think of it in a second. John had the answer on the tip of his tongue, but Anne said it first.
on the tip of your tongue
about to be said Her name is right on the tip of my tongue - Helen something or other, what is her last name!
on the tip of (one's) tongue
On the verge of being recalled or expressed.