spare no expense

Translations
не жалеть расходов
They spared no expense in making the wedding a grand affair.
Они не жалели расходов, чтобы сделать свадьбу грандиозным событием.
Definitions
To spend as much money as necessary to achieve a desired outcome, without worrying about the cost.
Words
spare

verb
не жалеть
no

article or possessive pronoun
никаких
expense

noun
расходов