to  do  a number on  somebody or something
do
du:
doo
a
ə
ē
number
nʌmbər
nambēr
on
ɒn
on
somebody or something

Definition & Meaning of "do a number on somebody or something "in English

to do a number on somebody or something
01

to seriously affect or harm someone or something, usually resulting in negative consequences 

Dialectamerican flagAmerican
to [do] a number on {sb/sth} definition and meaning
Idiom
Informal

What is the origin of the idiom "do a number on someone or something" and when to use it?

The idiom "do a number on someone or something" is believed to have its roots in American slang from the mid-20th century. The use of "number" in this expression likely refers to a performance or act, with "do a number" suggesting the idea of causing a significant impact or executing an action, often with negative consequences. Over time, this phrase evolved into an idiomatic expression used to describe situations where someone or something has been negatively affected or disrupted. It is commonly employed in everyday conversations, discussions about setbacks or difficulties, or when recounting experiences where someone or something has been significantly impacted, often negatively.

Examples
The flu really did a number on him; he was in bed for two weeks. 
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