The idiom "crack of dawn" refers to the very early morning hours, usually before sunrise. It is often used to describe a time when someone wakes up or starts their day. The phrase is typically associated with feelings of excitement, anticipation, and opportunity for new beginnings.

"A cinch" is an idiom that means something that is very easy to do or understand, or something that is not difficult to deal with. The figurative meaning of the idiom is that a task or situation is so straightforward that it seems like a snap or a breeze.

The idiom "on the drawing board" means that something is being planned or considered for future implementation. It suggests that the idea is still in its initial stages of development, and may not yet be finalized or fully formed.

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 "how come" is used to express surprise or disbelief about a situation, person, or thing. It can also be used to ask for an explanation or reason why something happened. The literal meaning of the phrase is "for what purpose" or "why.