A word or saying starting with the letter k?

Answer 1

• keep a lid on it
• keep a stiff upper lip
• keep a straight face
• keep in touch
• keep it under your hat
• keep it to yourself
• keep the peace
• keep your cool
• keep your ear to the ground
• keep your fingers crossed
• keep your hopes up
• keep your head above water
• keep your nose to the grindstone
• keep up with the Joneses
• keys to the kingdom
• kick the bucket
• kick the habit
• kick up ones heals
• kill time
• kill two birds with one stone
• knee high to a grasshopper
• knock-down-drag-out fight
• knock on wood
• know which side ones bread is buttered on
• knuckle down
• knuckle under