I am not sure what "double nudge" means apart from the obvious meaning of two nudges. There is an expression "nudge, nudge, wink, wink" which is a way of describing something someone says that has a double meaning. For example, a statement that has an obvious literal meaning but then a hidden meaning, perhaps sexual. Saying "Nudge, nudge, wink, wink" particularly as you nudge and wink at someone is a way of saying "do you see my secret second meaning"? Does that work in your context? If not, maybe you could fill in some more details?

I've honestly never heard that expression. Nudge means to prod (someone) gently, typically with one's elbow, in order to draw their attention to something. My guess would be the expression means to nudge someone twice. Where did you hear this?

Hello Eunjae, That's an interesting phrase. It makes me think of a fruit/gambling machine when you press the "nudge" button, but I wonder if that's the context you are referring to. I've looked on Google and have you found that phrase from a news article about new flexible working jobs? In that context, a "nudge" is a small incentive for someone to do something. The phrase "double nudge" is saying that have used two, little incentives to affect the behaviour of people.

Hi Eunjae, There are several meanings to this phrase. There is a popular British comedy sketch show called Monty Python's Flying Circus and it famously using the phrase, "wink, wink, nudge, nudge." It usually implies a double meaning. A first that stated and a second hidden meaning usually with sexual connotations. While you wouldn't usually say nudge to someone, you would nudge someone to get their attention. Hope this helps. Have a great day. Brad

Taxing salt and sugar are just ways of getting people to consume less salt and sugar, to improve their health. A nudge here is just a way of saying gently push someone to a better behaviour.