English phrase from drama scenes

What Does "you need to keep an eye on him" Mean?

Learn what "you need to keep an eye on him" means, when people say it, and how to use it naturally in English.

Intermediate
Neutral
Firm
Warn

But you need to keep an eye on him

It means the speaker wants someone to monitor a person because they may cause trouble or need attention.

From An Affair With My Boss, Episode 6

When do people say this?

Scene Context

The speaker warns someone to watch another person carefully.

Usage Scenario

Use this when asking someone to pay attention to another person's behavior. It can imply suspicion or concern.

Better ways to say it

1
Keep an eye on him.
2
You need to keep an eye on him.
3
Watch him closely.

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