to not consider the cost of something.

The team spared no expense in hiring players last year.

Related vocabulary: spare no effort to do something

• fire off something
• firing on all cylinders
• firm hand on the tiller
• first among equals
• first and foremost
• First come, first served.
• first-come, first-served
• first dibs on
• first dibs on something
• first-hand
• first hand
• [first/highest/next etc.] rung on the ladder
• First in, best dressed.
• first-past-the-post
• first rung on the ladder
• first string
• first-string
• first thing
• first thing in the morning
• first things first
• First things first.
• fish for compliments
• fishing expedition
• fish or cut bait
• Fish or cut bait.