a pretty penny

US /ə ˈprɪt.i ˈpen.i/
UK /ə ˈprɪt.i ˈpen.i/
"a pretty penny" picture
1.

a large sum of money

:
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That new car must have cost them a pretty penny.
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Renovating the old house will cost a pretty penny.
:
pennyprettypenny whistlepenny-pincherspend a pennythe penny dropsbe sitting pretty