to feel at home means to feel comfortable, warm and welcome
to feel as if you belong in a certain place
"Out of your mind" is an idiom. It makes no sense unless you already know that it means you are behaving in a crazy manner.
Someone is complimenting your intelligence.
You don't. That's not an idiom. You are probably thinking of the phrase bear in mind, which is not an idiom. "Bear" means to hold or carry something, so "bear in mind" just means to keep something in your mind or think about it.Bear in mind, you should always look up the meanings of words in a dictionary.
It means someone is very anxious or nervous about something. They could be doing an exam or an interview for example, and be feeling nervous about it. So they are a bundle of nerves.
It means that you are acting irrationally or acting crazy. The image is of a machine whose rocker has slipped out of the groove and is now rocking madly and damaging the rest of the machine.
It is not an idiom because you can figure out what it means. If something disagrees with you, then you don't like it or it makes you feel bad. This metaphor means that you don't like the climate.
It means that you feel euphoric and totally optimistic.
It means you feel great, you feel like you're worth a million bucks
"Feeling blue" IS an idiom - you cannot literally feel the color blue! Feeling blue means that you're sad.
"To be in" means that the person is home -- it's a short version of saying "to be in the house"
It means that they eat everything you have in your house
It means to feel that there is no way to go on and you just want to give up.
It means to be really frightened or scared.
It's not an idiom. It means exactly what it looks like.
The idiom "An Englishman's home is his castle " simply means that a man's home is his safest refuge. He can do whatever he can to protect themselves from an intruder. The use of force is also allowed under certain circumstances.
The idiom "walk on clouds" means to feel extremely happy or elated, as if one were floating or walking on air. It refers to a state of complete euphoria or bliss.
"Catching a cold" is an idiom - it means to come down with the symptoms of the cold virus.