Necessity is the mother of invention
Nervous as a long-tailed cat in a room full of rocking chairs
Never a rose without the prick
None so blind as those who will not see
Not a snowball’s chance in hell
Not enough room to swing a cat
Not have two nickels to rub together
Not have two pennies to rub together
Not know enough to come in out of the rain
Not much cop
Not the only pebble on the beach
Not trust someone further than you can throw them
Nothing ventured, nothing gained
