Definition & Meaning of "[let] {sb} have it"

What is the origin of the idiom "let someone have it" and when to use it?

The idiom "let someone have it" has its origins in a metaphorical extension of physical combat. Dating back to the early 20th century, it initially referred to delivering a forceful blow or attack. Over time, the expression evolved to include verbal confrontation or criticism, suggesting the delivery of a strong rebuke or scolding. The expression is used to convey a sense of confronting someone assertively or forcefully, either physically or verbally.