In Back ofHow to avoid the slang expression "in back of"
In back of is a slang expression meaning “behind.” Avoid using this expression in writing and formal situations.
in back of the house
behind the house
Common Errors in English Usage: Errors in diction and idiom commonly made by native speakers of English
List of Common Errors in English Usage (PDF): Printable version of the complete list
Common Grammar Errors: A list of common errors in grammar (topics like subject-verb agreement and parallelism) as distinct from usage