“In a jiffy” means very soon or very quickly. People use it in informal English when they want to say that something will happen after only a short wait.
The phrase makes sense because jiffy was already an English word for a very short moment by the late 1700s. It was not originally this exact idiom alone. The noun jiffy itself meant a brief instant, so in a jiffy naturally came to mean in a very short time.
Today, the expression is common in casual speech. It often sounds friendly, relaxed, or slightly reassuring. For example, if someone is waiting, you might say, I’ll be back in a jiffy. If food is almost ready, someone might say, Dinner will be ready in a jiffy.
A useful point for learners is that this phrase usually refers to the near future, not the past. It is most natural when promising speed or a short delay.
- Natural: I’ll help you in a jiffy.
- Natural: The app should load in a jiffy.
- Tone: informal and conversational
So when you hear this expression, think of a tiny moment of time. That older meaning explains why the phrase still suggests almost no waiting at all.