Luck is a way of understanding a personal chance event. Luck is good or bad. Luck is by accident or chance. Luck applies to a person, a group of people or other actor. Definition : The chance happening of fortunate or adverse events; fortune: They met one day out of pure luck. Good fortune or prosperity; success: We wish you luck. One's personal fate or lot: It was just my luck to win a trip I couldn't take. Idioms: as luck would have it As it turned out; as it happened: As luck would have it, it rained the day of the picnic. in luck Enjoying success; fortunate. out of luck Lacking good fortune. press (or push ) (one's) luck To risk one's good fortune, often by acting overconfidently. try (one's) luck To attempt something without knowing if one will be successful.