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Rare as hen's teeth
Something is as rare as hen's teeth if it is so uncommon that you need an idiom to exaggerate how uncommon it is! Hens have no teeth, so hen's teeth are so rare they do not exist at all.You found one of those at the thrift store? Well done, they are as rare as hen's teeth!

Reinvent the wheel
You reinvent the wheel when you invest a lot of time, money or effort into doing something that has already been done. This idiom is often used when a solution to something already exists and you could just use that instead.Let's not reinvent the wheel, and just use an existing service.

Rinse and repeat
The phrase to rinse and repeat means to do something repetitive, predictable way. It comes from the instructions on a shampoo bottle.You look up the code, put it in the right place, and then rinse and repeat for the rest of the papers.

Rome wasn't built in a day
Rome wasn't built in a day means that large projects take a lot of time, effort, and patience to achieve and you shouldn't expect quick results.This idiom relates to how the city of Rome gradually developed over centuries.
Don't worry that this is taking so long, Rome wasn't built in a day.
Rule of thumb
The phrase a rule of thumb means a simple guideline based on experience. It originates from when tradesmen used to roughly estimate measurements using the size of their thumb rather than any more accurate means.As a rule of thumb, save some money each month.
