The initial idioms of the letter N

not shed a tear	don't crap where you eat
not show face	show (one's) butt
show (one's) cards	show (one's) (true) colours
show (one's) (true) stripes	not sit well
not skip a beat	not sleep a wink
not bad	not so bad
not so fast	not so hot
not stand for it	not stand the sight of
not stand still for (something)	not suffer fools
not suffer fools gladly	not supposed to
not take anything for granted	not take (something) sitting down
not take kindly to	not take (something) lightly
not take no for an answer	take no for an answer, not
not take stock in (something)	not tell a soul
not the end of the world	not the half of