get carried away
US /ɡɛt ˈkærid əˈweɪ/
UK /ɡɛt ˈkærid əˈweɪ/
1.
to become overly excited or enthusiastic about something, often to the point of losing control or judgment
:
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It's easy to get carried away when you're planning a party.
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Don't get carried away with your spending; remember your budget.