It is an introduction to your first impression of something.
This isn't an idiom. It means just what it sounds like - someone is looking for things by using their senses to find them.
It means to tidy up, put everything in its place and make things look neat.
It means that you "Take a look" or to look at something.
To "look after" is to care for. It means to care for a small child.
It is not an idiom. It means "do not ignore the remarks." Remarks are things that are said, and someone wants you to stop ignoring them.
It means things which occur in secret.
To upset things in a spectacular way.
Meaning a very obvious difference between 2 things.
The best way to find out the meaning of an idiom is to look it up in a reputable dictionary or idiom database. You can also search online for the idiom along with the word “meaning” to find explanations and examples of its usage. Additionally, asking a native speaker or language teacher for clarification can help you understand the idiom better.
"To be" is not an idiom - it's a verb.
It means that everybody like what they like and have their own opinions about things.
It means that "she" is aware of or in control of the situation, issue, problem, or event.