8. Toe the Line
This idiom means to conform to a rule or standard. Sometimes it is misused as “tow the line,” which would obscure its military origins, which may have had something to do with literally arranging one’s feet in position on a line for inspection.
9. Pique My Curiosity
Incorrect forms of this expression abound, sometimes appearing as “peak my curiosity” or “peek my curiosity.” To pique means to prick or stimulate, which is not to be confused with the homophones “peak,” meaning apex, or “peek,” meaning glimpse.
10. All of a Sudden
“All of the sudden” is just plain wrong. Use “a” instead.
11. Case in Point
This expression is used when a specific instance serves as evidence, and it’s not “case and point,” as some people claim. “People really screw up the English language. Case in point—have you ever noticed how many people use the word ‘irregardless’?”