double-decker
US /ˌdʌb.əlˈdek.ər/
UK /ˌdʌb.əlˈdek.ər/
1.
a bus that has two levels, one above the other
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We took a double-decker bus tour of London.
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The iconic red double-decker buses are a symbol of London.
2.
a sandwich or cake with two layers of filling
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I ordered a double-decker club sandwich for lunch.
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She baked a delicious double-decker chocolate cake.