souffle

A soufflé is a delicate, baked dish made with a base of egg yolks and beaten egg whites, which gives it a characteristic airy, puffed-up texture. The mental image is of a tall, golden-brown creation that rises impressively in the oven but is famously fragile, collapsing if it isn't served immediately. In a figurative sense, the word is often used to describe something that is light, delicate, or prone to sudden collapse—like a plan or a reputation. It is most commonly used in culinary contexts, though you might hear it in professional environments to describe a project that looks impressive but lacks substance or stability.
In conversation
In a restaurant kitchen
Make sure you don't slam the oven door, the soufflé will fall!
Make sure you don't slam the oven door, the soufflé will fall!
Understood, I'll handle it with extreme care.
Understood, I'll handle it with extreme care.
Shows the literal, fragile nature of the dish.
Discussing a failing business plan
The entire proposal is like a soufflé.
The entire proposal is like a soufflé.
It looks great on paper, but it won't hold up under pressure.
It looks great on paper, but it won't hold up under pressure.
Demonstrates the metaphorical use for something lacking substance.
Examples
The chef prepared a chocolate soufflé for dessert.
The chef prepared a chocolate soufflé for dessert.
She watched anxiously as the soufflé began to rise in the oven.
She watched anxiously as the soufflé began to rise in the oven.
His political career turned out to be a soufflé: impressive to look at, but it collapsed the moment it faced real scrutiny.
His political career turned out to be a soufflé: impressive to look at, but it collapsed the moment it faced real scrutiny.