Keep one`s mouth shut
To be silent, to stay silent.I was very angry and told my friend to keep his mouth shut. Later, I had to apologize.
Keep one’s head above water
To have the ability to pay one`s bills. The man is having trouble keeping his head above water since his salary decreased.
Keep one`s head
To stay calm when there is trouble or danger.The president is a very good leader and is able to keep his head during an emergency.
Keep one’s hands off (someone or something)
To refrain from touching or handling someone or something.My aunt asked her nephew to keep his hands off her furniture.
Keep one’s hand in (something)
To retain some control of something.My uncle sold his business but he is still trying to keep his hand in some of its operations.
Keep one`s fingers crossed
To wish for good results in something that one is doing."Please keep your fingers crossed that I will pass my exam."
Keep one’s feet on the ground
To remain firmly established.My friend lost his job but he is trying hard to keep his feet on the ground.
Keep one’s eyes open
To remain alert and watchful for someone or something."Please keep your eyes open for a good place to eat so we can have lunch."
Keep one`s eye on the ball
To be watchful and ready for something."You should keep your eye on the ball or you will make a mistake."
Keep one’s distance from (someone or something)
To maintain a certain distance from someone or something.The girl always keeps her distance from the other students in the class.