English definition of “luck”
/lʌk/ noun [U]
BY CHANCE › good and bad things caused by chance and not by your own actions: It was just luck that I asked for a job at the right time. Then I met this gorgeous woman and I couldn't believe my luck. He seems to have had a lot of bad luck in his life.
SUCCESS › success: Have you had any luck (= succeeded in) finding your bag? He's been trying to find work but with no luck so far.
be in luck informal › to be able to have or do what you want: "Do you have any tuna sandwiches?" "You're in luck - there's one left."
Good luck! › something you say to someone when you hope that they will be successful: Good luck with your exam!
Bad/Hard luck! › used to show sympathy when someone is unsuccessful or unlucky: "They've run out of tickets." "Oh, bad luck!" → See also a stroke of luck