| kicks and giggles | | | |
| kick someone's ass | | | |
| kick someone when they are down | | | |
| kick some tail | | | |
| kick some tires | | | |
| kick the beam | | | |
| kick the bucket | | | |
| kick the can down the road | | | |
| kick the habit | | | |
| kick the tires | | | |
| kick the tyres | | | |
| kick to the curb | | | |
| kick up a fuss | | | |
| kick up one's heels | | | |
| kick upstairs | | | |
| kick with the other foot | | | |
| kid around | | | |
| kiddie table | | | |
| kid-glove | | | |
| killer instinct | | | |
| killing | | | |
| kill me | | | |
| kill one's darlings | | | |
| kill the fatted calf | | | |
| kill the goose that lays the golden eggs | | | |
| kill trees | | | |
| kill two birds with one stone | | | |
| kindest regards | | | |
| kindle-coal | | | |
| kindle-fire | | | |
| kind of | | | |
| kindred soul | | | |
| kindred spirit | | | |
| kind regards | | | |
| king of all one surveys | | | |
| king of beasts | | | |
| king of birds | | | |
| king of the castle | | | |
| king of the hill | | | |
| King of the Jungle | | | |
| king's cushion | | | |
| King Shit of Turd Island | | | |
| king's ransom | | | |
| kiss and cry | | | |
| kiss and make up | | | |
| kiss and tell | | | |
| kiss-and-tell | | | |
| kiss arse | | | |
| kiss ass | | | |
| kiss my ass | | | |
| kiss of death | | | |
| kiss off | | | |
| kiss of life | | | |
| kiss someone's ass | | | |
| kiss someone's ring | | | |
| kiss the gunner's daughter | | | |
| kiss up | | | |
| kiss up to | | | |
| kitchen table software | | | |
| knee-deep in the Big Muddy | | | |
| knee-high to a grasshopper | | | |
| knee-jerk reaction | | | |
| knee-slapper | | | |
| knight in shining armor | | | |
| knight of the post | | | |
| knit one's brows | | | |
| knit one's eyebrows | | | |
| knit together | | | |
| knock a buzzard off a shit wagon | | | |
| knock a dog off a gut wagon | | | |
| knock a skunk off a gut wagon | | | |
| knock down | | | |
| knock down a peg | | | |
| knock for a loop | | | |
| knocking on heaven's door | | | |
| knock it off | | | |
| knock it out of the park | | | |
| knock oneself out | | | |
| knock on heaven's door | | | |
| knock on wood | | | |
| knock out | | | |
| knock out of the box | | | |
| knock someone down with a feather | | | |
| knock someone flat | | | |
| knock someone into the middle of next week | | | |
| knock someone off their perch | | | |
| knock someone over with a feather | | | |
| knock someone's block off | | | |
| knock someone's socks off | | | |
| knock some sense into | | | |
| knock the living daylights out of | | | |
| knock the stuffing out of | | | |
| knock together | | | |
| know beans about | | | |
| know every trick in the book | | | |
| know from a bar of soap | | | |
| know inside and out | | | |
| know no bounds | | | |
| know one's ass from a hole in the ground | | | |
| know one's own mind | | | |