Idiom
not to mention someonenot to mention (someone/something)
and also someone or something else.Gaining weight didn't help her health, not to mention the high blood pressure that ran in her family.They don't have any of the players from that championship team anymore, not to mention manager Casey Stengel.
Usage notes: used to add emphasis to what you are saying
Related vocabulary: to say nothing of something, let alone do something