| 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 | | | |