splurge
US /splɝːdʒ/
UK /splɝːdʒ/

1.
spend a lot of money on something
:
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I decided to splurge on a new designer handbag.
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They splurged on a luxurious vacation to the Maldives.
1.
an act of spending money freely or extravagantly
:
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It was a rare splurge for her to buy such an expensive dress.
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We decided to have a big splurge on our anniversary dinner.