This idiom “off one's
rocker” is easy, it simply means that someone is crazy or insane.
For Example:
“He's off his rocker if he thinks he can tackle the whole
thing alone.”
This is the Idiom #77 in the List of 100 commonly used Idioms in everyday English (Top 100 famous Idioms). By introducing this list of notable idioms to English learners and ESL students as you, we believe that your English will sound more like a native and you can easily understand what native speakers are saying. Please like and share this list with your friends if you think it is helpful - the full list is here.
