goose egg
US /ˈɡuːs ˌeɡ/
UK /ˈɡuːs ˌeɡ/

1.
a score of zero in a game or competition
:
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Our team got a goose egg in the first inning.
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Despite their efforts, they ended the game with a goose egg.
2.
a large bump or swelling on the head, typically caused by a blow
:
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After falling, he had a huge goose egg on his forehead.
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The child cried after getting a goose egg from hitting his head on the table.