mainly American, informal

someone who is blamed for another person's mistake or crime.

The book claims Lee Harvey Oswald didn't kill President Kennedy - he was just the fall guy.

• knock socks off
• knock someone dead
• knock someone for a loop
• knock someone for six
• knock someone into shape
• knock someone off feet
• knock someone off pedestal
• knock someone off perch
• knock someone off their feet
• knock someone off their pedestal
• knock someone off their perch
• knock someone out
• knock someone's block off
• knock someone sideways
• knock someone's socks off
• knock someone up
• knock some sense into
• knock some sense into someone
• knock something down
• knock something into shape
• knock something off
• knock something on the head
• knock something out
• knock something's socks off
• knock spots off