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(To) keep a low profile:
To lay low. To not attract attention to oneself by talking loudly, dressing in flashy clothes, causing trouble, etc. ex. "The bank robbers knew that they had to keep a low profile until they crossed the border."
(To) keep an eye on:
To watch. To pay attention to. ex. "I have to go to the store. Can you please keep an eye on the baby for 10 minutes?"
(To) keep a straight face:
To force oneself not to laugh, even though one wants to. ex. "He was saying the stupidest things, and I was finding it hard to keep a straight face."
(To) keep one's cool:
To remain calm.
(To) keep one's word:
To uphold one's promise. ex. "He's a very honorable person who always keeps his word."
(To) keep someone posted:
To keep someone informed.
(To) keep someone up:
To not allow someone to sleep. ex. "The neighbors' party kept me up all night."
(To) keep something to oneself:
To not let others know about something. To not reveal something. ex. "Hey, don't tell anyone about your time in prison. Keep it to yourself."
(To) keep track of:
To maintain a record of. ex. "I don't know where all my money goes. It's hard to keep track of my expenses."
(A) kept man/woman:
Someone who is in a relationship where the other person pays for everything. ex. "Stephen's girlfriend always pays for everything. He's such a kept man."
(To) kick back:
(To) kick oneself:
(To) kill time:
To waste time.
Knock it off!:
Knock on wood:
A phrase said to cancel out (imaginary) bad luck.
(To) know something inside-out:
To know something completely and thoroughly. ex. "Let me show you around - I know this neighborhood inside-out."
(To) know the score:
To know the facts. To know how things go.
A person who acts like they know everything. ex. "Robert is so conceited! Yeah, he's a real know-it-all."