This is not an idiom - it means exactly what it says. You should stay fit and healthy.
An idiom is a saying or expression. There are many idioms that mean to stay away from, or avoid, someone. An example of such an idiom would be, "to steer clear of" someone.
Stay calm
It's not an idiom; it means that someone is the favorite of another person. A favorite means that they are the best-liked of the group.
To stay in touch is to continue to write/text/call or otherwise stay in contact with someone.
It means stay with the rest of the group.
This is not an idiom - it means exactly what it says. You should stay fit and healthy.
It's not an idiom because it means just what it seems to mean. You should stay on the side of the fence that you are currently on and not climb over.
An idiom is a saying or expression. There are many idioms that mean to stay away from, or avoid, someone. An example of such an idiom would be, "to steer clear of" someone.
Stay calm
This is not an idiom. It means exactly what it says. The company that this person keeps is not a good group of people.
It means the favorite or favored person in the group. A similar idiom is "fair haired child."
It's not an idiom; it means that someone is the favorite of another person. A favorite means that they are the best-liked of the group.
To stay in touch is to continue to write/text/call or otherwise stay in contact with someone.
This is not an idiom. A herd is a group of certain animals, like sheep and cows. This phrase just means a group of sheep. You might have heard someone comparing people to a herd of sheep. That is not an idiom, but a simile saying that some people act like sheep.
This isn't an idiom. Telling a story means to speak and relay a tale - which can be a true one or a false one.
Stay calm; stick to your guns, and you will carry the day.