From Longman Dictionary of Contemporary Englishspare no expense/effortspare no expense/effortSPEND MONEYto spend as much money or do everything necessary to make something really good or successfulspare no expense/effort to do something No expense was spared in developing the necessary technology. No effort will be spared to bring the people responsible to justice. → spare
Examples from the Corpus
spare no expense/effort to do something• If you suspect you will be facing a greater daemon spare no effort to acquire the Banishment spell.• Mrs Grindlewood-Gryke had spared no expense to feed the multitude.• He is totally dedicated to his calling, his art, and spares no expense to fulfil it.• She was often ill, and Hubert spared no effort to make her well again.• It attracted more retail savings than even the government, which spares no effort to tap the market. 