regardless of expense; sparing no expense
Used when someone spends money freely without worrying about the cost, often in the context of a project, gift, or indulgence.
He spares no expense on cameras for his hobby.
We intend to work on this project regardless of expense.
金に飽かす also means spending freely, but emphasizes using wealth lavishly, often with a nuance of showing off, while 金に糸目をつけない focuses on not caring about the cost.
Standard kanji spelling for this expression.
Variant with 付けない; both spellings are used.
糸目 is the system of bridle strings that controls a kite. 金に糸目をつけない likens unrestricted spending to letting a kite fly without such restraint.