(especially, UK) a single-deck bus, which has only one level for passengers, unlike a double-decker.
I travelled home on a crowded single-decker - over half of the passengers were schoolchildren.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.