- Keep step
- Keep the pace
- Keeping bullets
- Keeping prop
- Kelly
- Keloid
- Ken
- Kept
- Kerbstone
- Kerchief
- Kerfuffle
- Key industry
- Key stroke
- Key to
- Key-man
- Key-ring
- Keystone
- Khoya
- Kibbutz
- Kick down ladder
- Kick person upstairs
- Kick starter
- Kick the habit
- Kick up
- Kick up dust
- Kidnapper
- Kill off
- Kill the goose that lays golden egg
- Kill time
- Kathakali
- Kali
- Kalian
- Killer beast
- Killing
- Kilobauh
- Kilometer
- Kilometre
- Kilowatt
- Kimono
- Kin
- Kinanthropometry
- Kind of celibacy consisting of 8 aspects or attributes
- Kind of rice-cake
- Kindergarten
- Kindliness
- Kinetic
- Kinetics
- King dasaratha
- King of persia
- King-cobra
- Kingcraft
- Kingly
- Kingpin
- Kings advisor
- Kink
- Kinship
- Kinswoman
- Kirsch
- Kiss curl
- Kissogram
- Kitchen
- Kitchen-garden
- Kitchenette
- Kitchenware
- Kitsch
- Kitten
- Knacker's yard
- Knackered
- Knackers yard
- Knavish
- Knee-breeches
- Knee-deep
- Kneecap
- Kneel down
- Knelt
- Knick knack
- Knife-edge
- Knightly
- Knock about
- Knock off
- Knock the spots off
- Knock-up
- Knockout
- Knot
- Knottiest
- Know a person by name
- Know a thing or two
- Know inside out
- Know ones onions
- Know ones own mind
- Know the place like the back of ones hand
- Know the time of day
- Know what one is talking about
- Knower
- Knuckle
- Knuckle-under
- Kohinoor
- Kohlrabi
- Konganadu
- Kookaburra