WordsiMeaninghimself / herself / themselves (dative)Part of speechpronounPronunciationCoursePortuguese (Portugal)LessonSudden realization (dar por si a)Usages of siÀs vezes, ele dá por si a cantarolar uma canção.Sometimes, he suddenly realizes he is humming a song.A rapariga absorta deu por si a olhar fixamente para o ecrã.The engrossed girl suddenly realized she was looking fixedly at the screen.