Definition & Meaning of "let something roll off one's back "in English

What is the origin of the idiom "let something roll off one's back" and when to use it?

The phrase "let something roll off one's back" originated as an idiomatic expression in the English language. It suggests the ability to remain unaffected by criticism, insults, or negative comments, essentially having a thick skin and not allowing such remarks to cause distress or emotional harm. The phrase conjures the image of water rolling off a duck's back without causing any harm, emphasizing resilience and the ability to maintain composure in the face of adversity.