The usual implied meaning is that the "someone" that you're going to "have a word with" has done something that you take issue with. Saying you're going to have a word with them means you're going to talk to them -- often to chastise or threaten them, as the case may be.
This is similar to the idiomatic "have words with", which means to have a discussion, or more commonly, to argue with someone.
The idiom means impress someone is egg on
Pest is not an idiom. It's a word.
berate someone
An idiom is a phrase that seems to be nonsense unless you know the definition. The word band's is the possessive of the word band, meaning "belonging to the band." It is a word, not an idiom.
No, the word "feeling" is not an idiom. It is a noun that refers to an emotional state or perception of a situation.
To complain or criticise someone out of their hearing.
It's not an idiom because you can figure out the meaning by context - you are willing to go through dangers or hardship for something or someone.
No, an idiom is not a slang word. An idiom is a commonly used expression with a figurative meaning that is different from its literal meaning. Slang, on the other hand, refers to informal words and phrases that are specific to a particular group or generation.
In one word: dead.
It means that you disagree with someone; you are opposed to what they want.
To raise hopes is to cause someone to have more hope. It's not really an idiom because you can figure out the meaning pretty easily.
No, a synonym is a word that means the same as another word. An idiom is a phrase that does not have a literal meaning. Ex, mountains out of mole hills.