• out of date issue of a serial publication; anything out of date a back number is the same as a back copy.
پیشنهاد کاربران
روزنامه باطله
( عامیانه ) آدم اُمل، قدیمی, از مد افتاده ( someone and sth ) . مثال: The singer was a huge star in the 1980s, but she's just a back number now That hat is really a back number