the best of luck (with something) | good luck (with something)idiomPart ofluckthe best of luck (with something) | good luck (with something)the best of luck (with something) | good luck (with something) — idiomidiom1. You say this to wish someone success in what they are doing.1.idiomDefinitionYou say this to wish someone success in what they are doing.ExampleThe best of luck with your new job, Anna!Good luck with your driving test tomorrow.