off his rocker

USAGE SUMMARY

"off his rocker" is a correct phrase in written English.
It is an informal idiom that means that someone is acting in an irrational or eccentric manner. Example sentence: "I think Jeff has gone off his rocker lately, his behavior has become increasingly strange."

✓ Grammatically correct

News & Media

Human-verified examples from authoritative sources

Exact Expressions

50 human-written examples

The first caller said Klein was "off his rocker".

The Guardian - Opinion

It continues to have this meaning today, though the close association with nuttiness (by O'Neill via Guzik) gives fruitcake a primary slang meaning of "crazy; off his rocker".

The New York Times - Magazine

"You'll see a pompous defense lawyer, a brilliant judge, a judge a little off his rocker, D.E.A. agents who are honest, some federal agents who are shady -- they all have business being there.

The New York Times

When President Obama announced his plan a week and a half ago to send a hundred United States troops to central Africa to aid in the search for Lord's Resistance Army rebels, the American public was, predictably, a little confused, and Rush Limbaugh was, predictably, a little off his rocker.

The New Yorker

By Alexis Okeowo October 25, 2011 When President Obama announced his plan a week and a half ago to send a hundred United States troops to central Africa to aid in the search for Lord's Resistance Army rebels, the American public was, predictably, a little confused, and Rush Limbaugh was, predictably, a little off his rocker.

The New Yorker

Why, the man's off his rocker!" a man cried.

Huffington Post

Human-verified similar examples from authoritative sources

Similar Expressions

10 human-written examples

There are also the eccentric witnesses such as Ginsberg, and, at the center, the somewhat off-his-rocker Judge Julius Hoffman.

Los Angeles Times

Reports that Wood is drinking two bottles of vodka a day, and has run away from his family for fear they would try and stop him, complete the picture of a man unable to shake off the hallmarks of his rocker youth.

Independent

Onstage, Ian pulled off his solo like a veteran rocker.

The New York Times

Rocker Tommy Lee takes off his shirt while saying, "Hey listen.

Huffington Post

"Trump is the only one who's going to get my vote because he's off his goddamn rocker," Bobby says.

The Guardian

Expert writing Tips

Best practice

Use "off his rocker" to describe someone's behavior when they are acting in an irrational, eccentric, or foolish way. It's suitable for informal settings and adds a colorful touch to your writing.

Common error

While "off his rocker" is a vivid expression, it's too informal for professional documents, academic papers, or formal presentations. Opt for more neutral terms like "irrational" or "unstable" in those settings.

Linguistic Context

The primary grammatical function of "off his rocker" is to act as a predicate adjective, describing a subject's state of mind or behavior as irrational or eccentric. Ludwig's examples show it's used to characterize individuals deemed as behaving strangely or foolishly.

Expression frequency: Common

Frequent in

News & Media

100%

Less common in

Science

0%

Formal & Business

0%

Academia

0%

Ludwig's WRAP-UP

In summary, "off his rocker" is an idiomatic phrase used to describe someone behaving irrationally or eccentrically, as validated by Ludwig. It's classified as grammatically correct but informal, making it suitable for casual contexts like news articles or informal conversations. While widely understood, it should be avoided in formal or professional settings where more neutral language is appropriate. The phrase is common in News & Media as shown in the Ludwig examples.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

out of his mind

This alternative suggests a state of mental instability, similar to losing touch with reality.

lost his marbles

This is a more informal way of saying someone is acting foolishly or irrationally.

gone crazy

This phrase simply indicates a state of extreme excitement or irrationality.

batty

A more informal and playful way to describe someone as eccentric or slightly mad.

nuts

A concise and informal term for someone behaving irrationally.

unhinged

Implies a loss of emotional control and stability.

deranged

Suggests a more severe form of mental instability.

round the bend

British slang for someone who is considered mad or eccentric.

not all there

Suggests someone is mentally absent or confused.

flipped his lid

Indicates that someone has lost their temper or control.

FAQs

How can I use "off his rocker" in a sentence?

You can use "off his rocker" to describe someone behaving irrationally. For example: "After the argument, he seemed completely "out of his mind" and was definitely "off his rocker".

What's a less informal alternative to "off his rocker"?

Instead of "off his rocker", consider using phrases like "irrational", "unstable", or "eccentric" depending on the specific context and level of formality required.

Is "off his rocker" grammatically correct?

Yes, "off his rocker" is grammatically correct, though it's an informal, idiomatic expression. It's perfectly acceptable in casual conversation and informal writing.

Which is more appropriate: "off his rocker" or "out of his mind"?

Both "off his rocker" and "out of his mind" convey similar meanings, but "off his rocker" is slightly more playful. The better choice depends on the tone and audience.