The idiom "in tandem" refers to two or more people working together as a team, often with equal responsibilities and roles. This can be used to describe a group of friends, co-workers, or even strangers who are united by a common goal.

The idiom "crash course" refers to a rapid, intensive, and comprehensive learning experience that covers all the important topics or skills necessary for a particular activity or goal.

The idiom "it’s anyone’s call" means that the outcome of a situation or event is uncertain, and anyone could win or lose equally. It expresses the idea that there are no strong indications of who will come out on top in a particular situation, making it too close to call.

"Three cheers" is an idiomatic expression that means to give a toast or raise a glass of something in honor of someone or something. It's a way to show appreciation and respect, typically at a social gathering or celebration.

The idiom "belle of the ball" is used to describe someone who is elegant, charming, and attractive. This person stands out at social events or gatherings and is often the center of attention.