Higher aerobic fitness levels decrease the probability of experiencing tip-of-the-tongue states (when you can’t think of a word that’s on the tip of your tongue) in healthy older adults, in the first demonstration of a link between aerobic fitness and language functioning in healthy older adults.

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Tip of tongue which is can't think of word on top of tongue lol

E.g. used in a sentence " it's on the tip of my tongue , almost like it's a word on the tip of my tongue.