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 (one's) tongue
On the verge of being recalled or expressed.