We’ve all been there.
You know what you’re trying to say, but for some reason the word is just stuck.
So why exactly does this happen?

When you know the word you’re thinking of, only the conceptual aspect of sharing it is activated.
And while it may be infuriating, it is far from uncommon.
In fact, it is so common that most languages have a phrase for it.

But what can you do about it?
But all hope isn’t lost!
Hand clenching is believed to activate the regions of your brain involved in memory formation and can aid recall.