- Keep at it
- Keep body and soul together
- Keep dark
- Keep house
- Keep morale
- Keep mouth shut
- Keep on a tight rein
- Keep one powder dry
- Keep one's mouth shut
- Kerb crawling
- Keep ones head
- Key flute
- Keep ones temper
- Keep oneself in
- Keep order
- Keep sb up
- 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
- Kalam
- Kilo
- Kilohertz
- Kind
- Kindly
- Kinds
- Kinesthetic
- Kinetic energy
- King fish
- King mackerel
- King of kerala
- King of small aloe
- King's
- King-maker
- King-size
- Kingdom
- Kowtows
- Kings fool
- Kinkily
- Kinky
- Kiosk
- Kipper
- Kirk
- Kitchen charcoal
- Kitschy
- Kleptomania
- Kleptomaniac
- Klutz
- Knave
- Knavery
- Knead
- Kneading machine
- Knee-jerk
- Kneel
- Knees
- Knight
- Knight of the road
- Knit ones brows
- Knitting-needle
- Knitwear
- Knobbly
- Knock
- Knock down to
- Knock knee
- Knocking someone with a feather
- Knottiness
- Knotty
- Know ones stuff
- Know through and through
- Know-how
- Knowingness
- Knowledge
- Knowledgeable
- Knox
- Knuckle-down