on the tip of one's tongue

Idioms  

1. Ready to utter something but unable to remember it at the moment, as in I met him last year and his name is on the tip of my tongue—it'll come to me in a minute. [Early 1700]

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on the tip of one's tongue

Listen to the surging Say You'll Be There: the groove is penetrating, but the whole thing sounds suspiciously like an Earth, Wind and Fire song that's just on the tip of one's tongue.

From Time Magazine Archive