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Livia
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December 19, 2016
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Someone else’s
Correct form: passers-by. Why? Because "passer" is a noun and it can be made plural and because passer-by is hyphenated!! "Standoffs" is normal because it is not.
Also, check a reliable, good dictionary: http://www.macmillandictionary.com/dictionary/british/passer-by?q=passer