Select the most appropriate meaning of the given idiom.

Snake in the grass

a deceitful person

The most appropriate meaning of the idiom "snake in the grass" is a deceitful person.

It means someone who is outwardly friendly and innocent, but who is secretly treacherous or malicious. The idiom comes from the fact that snakes are often hidden in the grass, and can be difficult to see until they strike.

The other options are not correct.

• A mean person: This is not the same as a deceitful person. A mean person is someone who is intentionally hurtful or unkind.
• A suspicious person: This is not the same as a deceitful person. A suspicious person is someone who is wary or distrustful of others.
• A slippery person: This can be a synonym for a deceitful person, but it is not the most common meaning of the idiom.