At the snap of a finger?

If it means "very quickly", then it must be used sometimes, though I haven't heard it used for a long time.

"In the blink of an eye" is a more common idiom.

What is the sound of one finger snapping?

MustAskAre you familiar with the expression "at/in the snap of a finger"?Is it something native speakers use?

I believe I've heard it, probably a long time ago. I don't hear anyone using it these days.

CJ

Vorpar"In the blink of an eye" is a more common idiom.

Another expression is 'at the drop of a hat'.

khoffWhat is the sound of one finger snapping?

It's even more quiet than one hand clapping. For either, you must listen very, very carefully.

Or you could say that it's the same effect as looking at a four-sided triangle. It creates a neuron buzz in your brain that can drive you to "riddle madness", so it's best not to listen or look at all.

CJ

CalifJimOr you could say that it's the same effect as looking at a four-sided triangle. It creates a neuron buzz in your brain that can drive you to "riddle madness", so it's best not to listen or look at all.CJ

And 4 out of 3 people struggle with math.

One finger snaps against the palm of your hand. The other just serves as something of a trigger. Very difficult to make two fingers snap together.

... one in every crowd.

CJ