Cast/draw/throw a veil over something negative spoken language verb phrase
To avoid talking about something because it is unpleasant.
Mom, I don't want to talk about that problem now, can we just draw a veil over it.
To avoid having a fight about that issue, they decided to draw a veil over it.
Every time I try to mention having a child, James always seems to draw a veil over it.
After two hours of debate about that issue, we decided to cast a veil over it.
It's mostly used in the present tense.
If you fall for someone's trick the first time then they are at fault.
Are you going to mess with me again? Fool me once, shame on you; fool me twice, shame on me.