Keep a low profile Keep a stiff upper lip Keep a straight face Keep at arm's length Keep it to yourself Keep it under your hat Keep the ball rolling Keep the home fires burning Keep up appearances Keep up the good work Keep up with the Joneses Keep your chin up Keep your ear to the ground Keep your fingers crossed Keep your head above water Keep your mouth shut Keep your nose clean Keep your nose to the grindstone Kick the bucket Kill the goose that lays the golden eggs Kill two birds with one stone Kindred spirit Kiss and tell Kiss of death Knock on wood Knock their socks off Knotty question Know a thing or two Know all the answers Know for a fact Know the ropes Know whatÕs what Know where one stands Know which side your bread is buttered on