The idiom "jump to conclusions" refers to making a decision or forming an opinion without having enough evidence or information. It is a hasty and impulsive action that can lead to incorrect judgments or misconceptions.

The idiom "on the tip of my tongue" means that something is almost ready to be remembered or expressed, but it hasn't quite come to mind yet. It can also indicate that someone is thinking of something and will speak or act on it soon.

The idiom "up in the air" is a figurative expression used to describe something that has not yet been decided or determined, or something that is uncertain or unclear. It can also be used to refer to a situation that is being deliberated upon or discussed.

The idiom "in the bad books" means that someone has done something wrong or offended someone, which has caused them to be disliked or avoided. It is a figurative expression that suggests that someone's behavior has put them in a negative light.

"Come hell or high water" is an idiom that means no matter what happens, someone will do something or be there for another person. It's a phrase that indicates a commitment to stand by someone through good times and bad.