| nail down |
| nail the hammer on the head |
| name names |
| name of the game |
| Nantucket sleigh ride |
| narrow down |
| nature abhors a vacuum |
| nature calls |
| nearest and dearest |
| nearly man |
| necessary evil |
| neck and neck |
| necktie party |
| needle drop |
| needless to say |
| need one's eyes checked |
| neither fish nor fowl |
| neither here nor there |
| nervous hit |
| never in a million years |
| never the twain shall meet |
| never you mind |
| new kid in town |
| new kid on the block |
| new territory |
| new wine in an old bottle |
| next thing one knows |
| nice guy |
| nickel and dime |
| nickel-and-dime |
| nigger nose |
| nigger rich |
| night owl |
| night person |
| nine times out of ten |
| ninth-inning |
| nip in the bud |
| Nixon in China |
| no bones about it |
| no borax, no glue |
| no comment |
| no-count |
| nod off |
| nod out |
| no fun at parties |
| no go |
| no guts, no glory |
| no hard feelings |
| no horse in this race |
| no joy |
| no more |
| non-denial denial |
| none the wiser |
| non-starter |
| no pain, no gain |
| no plan survives contact with the enemy |
| north forty |
| north of |
| nose |
| nose about |
| no sense no feeling |
| nose out of joint |
| nose test |
| nose to the grindstone |
| no skin off one's back |
| no skin off one's nose |
| no soap |
| not by a jugful |
| not by any means |
| not do someone any favors |
| not do someone any favours |
| not grow on trees |
| not half bad |
| nothing doing |
| nothing for it |
| nothing more than |
| nothing short of |
| nothing ventured, nothing gained |
| not hit a cow's arse with a banjo |
| not in a million years |
| not in Kansas anymore |
| not invented here |
| not just a pretty face |
| not likely |
| not long for this world |
| not one's first rodeo |
| not on your life |
| not see someone for dust |
| not so fast |
| not to mention |
| not to put too fine a point on it |
| not want to do that |
| not win for losing |
| not worth a dime |
| not worth a plug nickel |
| not worth salt |
| not worth writing home about |
| nourish a viper in one's bosom |
| now and again |
| no ways |