play gooseberry
US /pleɪ ˈɡuːs.ber.i/
UK /pleɪ ˈɡuːs.ber.i/
1.
to be an unwanted third person with two people who want to be alone, especially two lovers
:
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I felt like I was playing gooseberry when they started holding hands.
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We wanted to have a romantic dinner, but my little brother insisted on coming along and playing gooseberry.