A Biro brand ballpoint pen.
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(uncountable, by extension) Ink from a ballpoint pen.
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(by extension, UK, Commonwealth, Ireland) Any ballpoint pen.
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Add your own interpretation of "biro".
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.