Definition & Meaning of "it would not do {sb} any harm"

What is the origin of the idiom "it would not do someone any harm" and when to use it?

The idiom "it would not do someone any harm" originated in the early 18th century to suggest that undertaking a particular course of action could potentially benefit someone, even if it did not actively improve their situation. It is used to acknowledge or inspire trying something new might be harmless or even helpful.