| keel over | | | |
| keep a lid on | | | |
| keep an eye out | | | |
| keep good time | | | |
| keep it moving | | | |
| keep it up | | | |
| keep one's cards close to one's chest | | | |
| keep one's eye on the ball | | | |
| keep one's head | | | |
| keep one's knickers on | | | |
| keep one's options open | | | |
| keep one's temper | | | |
| keep pace | | | |
| keep someone busy | | | |
| keep someone on their toes | | | |
| keep tabs on | | | |
| keep the peace | | | |
| keep up | | | |
| keep watch | | | |
| kick a dog when it's down | | | |
| kick at an open door | | | |
| kick butt | | | |
| kick in the teeth | | | |
| kick loose | | | |
| kick out the jams | | | |
| kick someone when they are down | | | |
| kick the bucket | | | |
| kick the tyres | | | |
| kick upstairs | | | |
| kid-glove | | | |
| kill one's darlings | | | |
| kill two birds with one stone | | | |
| kind of | | | |
| king of all one surveys | | | |
| king of the hill | | | |
| king's ransom | | | |
| kiss-and-tell | | | |
| kiss of death | | | |
| kiss someone's ring | | | |
| kitchen table software | | | |
| knee-slapper | | | |
| knit one's eyebrows | | | |
| knock a skunk off a gut wagon | | | |
| knocking on heaven's door | | | |
| knock on heaven's door | | | |
| knock someone down with a feather | | | |
| knock someone over with a feather | | | |
| knock the living daylights out of | | | |
| know every trick in the book | | | |
| know one's ass from a hole in the ground | | | |
| know someone | | | |
| know someone in the biblical sense | | | |
| know where the bodies are buried | | | |
| knuckle dragger | | | |
| kangaroo court | | | |
| keep a close watch | | | |
| keep an eye on | | | |
| keep a weather eye open | | | |
| keep it between the ditches | | | |
| keep it real | | | |
| keep on | | | |
| keep one's cool | | | |
| keep one's fingers crossed | | | |
| keep one's head down | | | |
| keep one's mouth shut | | | |
| keep one's pecker up | | | |
| keep one's voice down | | | |
| keep shtum | | | |
| keep someone in the loop | | | |
| keep someone sweet | | | |
| keep the bones green | | | |
| keep the show on the road | | | |
| keep up with the Joneses | | | |
| kettle of fish | | | |
| kick ass | | | |
| kick back | | | |
| kicking and screaming | | | |
| kick into touch | | | |
| kick one's heels | | | |
| kicks and giggles | | | |
| kick some tires | | | |
| kick the habit | | | |
| kick up a fuss | | | |
| kid around | | | |
| killing | | | |
| kill the goose that lays the golden eggs | | | |
| kindle-coal | | | |
| kindred spirit | | | |
| king of birds | | | |
| king's cushion | | | |
| kiss and make up | | | |
| kiss ass | | | |
| kiss of life | | | |
| kiss up | | | |
| knee-high to a grasshopper | | | |
| knight of the post | | | |
| knock a buzzard off a shit wagon | | | |
| knock down a peg | | | |
| knock it out of the park | | | |
| knock out | | | |