student asking question

What is this expression mean?

teacher

Native speaker’s answer

Rebecca

"Thicker than water" is an idiom shortened from "blood is thicker than water". "Blood is thicker than water" means that there is a strong family bond. Basically, it means that your family is one of the most important things in your life. Thick blood is used as a metaphor to show that family bond is very strong. In this video, he is saying that brothers have strong bond and they care about each other.

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