to say nothing of something

to say nothing of (someone or something)

Not even considering or mentioning the significance or impact of someone or something else. It will take me at least two hours to fix this part of the fence, to say nothing of repairing all of it. Their newborn will be difficult enough to take care of while they're away, to say nothing of their temperamental toddler.
See also: nothing, of, say

to say ˈnothing of something

and also; not forgetting: She is an expert in Chinese, to say nothing of speaking several European languages.
See also: nothing, of, say, something