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English definition of “be on the tip of your tongue”

be on the tip of your tongue

If something that you want to say is on the tip of your tongue, you think you know it and that you will be able to remember it very soon: Her name is on the tip of my tongue.Forgetting and forgetfulness
(Definition of be on the tip of your tongue from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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