you're in luck

be in luck

To experience good fortune, typically when one's wishes are fulfilled unexpectedly. A: "Aw, man, I can't believe I forgot to bring my headphones with me to the gym." B: "Well, you're in luck—I have an extra pair you can borrow."
See also: luck

you’re in ˈluck

,

your ˈluck is in

you are lucky at the moment: I knew my luck was in today when all the traffic lights were green on my way to work. And now I’ve found that money I lost.
See also: luck
References in periodicals archive ?
If you like edamame (Japanese soy beans) you're in luck, and wheat germ, flax seeds, walnuts, and canola and fish oils are also great sources.
If that left you hungry for more, then you're in luck.
If you want a lot of information but don't want to carry around a tome, you're in luck.