Wordpor si acasoMeaningjust in casePart of speechadverbPronunciationCourseSpanish (Spain)LessonPrecautions (por si)Usages of por si acasoEl padrino tiene las alianzas por si acaso.The best man has the wedding rings just in case.Pondré el ramo en el agua por si acaso.I will put the bouquet in the water just in case.