张扬 means both 'to flaunt' (like 炫耀/夸耀) and 'to publicize/spread' (like 散布/宣扬), but it often carries a negative tone of being excessive or attention-seeking. It is broader than 炫耀 (deliberate showing off) and 散布 (neutral dissemination), and is commonly used in contexts like 张扬个性 (flaunt personality) or 张扬出去 (spread around).