Multiple choice general knowledge If you need him, he can turn on a ____ and help you immediately. dime nickel penny quarter Reveal answer Fill a bubble to check yourself A Correct answer Explanation The idiom 'turn on a dime' means to change direction or action very quickly and precisely. A dime is small, so turning on it suggests precise, immediate movement. 'Nickel,' 'penny,' and 'quarter' aren't part of this common expression.