not to be entirely wrong with something

to not be short of a bob or two

I'm not in pain.

I’m not exactly mad about this

It is not enough to adjust a few screws

to not be someone’s business

not to take warnings seriously

I’m not feeling myself today

I do not eat meat, or chicken and not fish

He’s not very trustworthy. So you’d better take what he says with a grain of salt

He’s not an easy man to deal with

I’m not joking!

to not be someone’s cup of tea

If it’s not broken, don’t fix it!

I [do not] eat eggs, milk or cheese

not to be conscious of having done any wrong

I’m not making any promises

to not be taking any chances

not to be half bad

I’m not particular

not a bad screw

to not be up to much

It is not best to swap horses while crossing the river

not a creature

to not be up to scratch