1 n-uncount Luck or good luck is success or good things that happen to you, that do not come from your own abilities or efforts.
I knew I needed a bit of luck to win..., The Sri Lankans have been having no luck with the weather..., The goal, when it came, owed more to good luck than good planning.
2 n-uncount Bad luck is lack of success or bad things that happen to you, that have not been caused by yourself or other people.
I had a lot of bad luck during the first half of this season..., Randall's illness was only bad luck.
4 If you ask someone the question `Any luck?' or `No luck?', you want to know if they have been successful in something they were trying to do.
any luck convention
5 You can say `Bad luck', or `Hard luck', to someone when you want to express sympathy to them.
bad luck convention
Well, hard luck, mate.
6 If you describe someone as down on their luck, you mean that they have had bad experiences, often because they do not have enough money.
down on one's luck phrase usu v-link PHR
7 If you say `Good luck' or `Best of luck' to someone, you are telling them that you hope they will be successful in something they are trying to do.
good luck/best of luck convention
He kissed her on the cheek. `Best of luck!'
8 You can say someone is in luck when they are in a situation where they can have what they want or need.
be in luck phrase V inflects
You're in luck. The doctor's still in.
9 If you say that someone is out of luck, you mean that they cannot have something which they can normally have.
be out of luck phrase V inflects
`What do you want, Roy? If it's money, you're out of luck.'
10 If you say that someone is pushing their luck, you think they are taking a bigger risk than is sensible, and may get into trouble.
push one's luck phrase V inflects
I didn't dare push my luck too far and did not ask them to sign statements.
11 If someone tries their luckat something, they try to succeed at it, often when it is very difficult or there is little chance of success.
try one's luck phrase V inflects
She was going to try her luck at the Las Vegas casinos.