Definition
This idiom suggests that it is often best to say as little as possible about a delicate or problematic issue in order to avoid prolonging it or making it worse.
About that argument, I think it's best if we keep quiet. 'Least said soonest mended,' right?
The mistake has already been made; it's best not to bring it up again. 'Least said, soonest mended'.
I don't want to talk about this anymore; let's just apply 'least said soonest mended.'