It has to be “no to nothing”
The clue for 43 down is “Make whole” and the answer has to be “mend”
This morphs the answer of 46A to “no to nEthing” which makes no sense at all. (My emphasis.)
Now of course I am well aware that I am certain to be dead wrong on this. Will Shortz doesn’t let idiotic typos occur in his puzzle column.
So, even though I’ll be deeply embarrassed, please tell me where I am messing up.