The initial idioms of the letter K

Keep in touch	keep in training
keep in with	keep in with (someone)
keep inside	keep it between the ditches
keep it down	keep mum
Keep it real!	keep it up
Keep it up!	keep kosher
keep late hours	keep mind on
keep mouth shut	change up with the times
keep no more cats than can catch mice	keep nose clean
keep nose out of	keep nose out of business
keep nose to the grindstone	keep off
keep off back	keep on
have on a short leash	keep on a tight leash
keep on about	keep on an even keel
keep on at	keep on its feet