The phrase "neck and neck" means that two or more things, people, or ideas are equal in value, importance, or quality. It is often used to describe a close race between two competitors where neither has an advantage over the other.
Sentences with «neck and neck»
The mayor, who had a sizeable lead against each of his Democratic contenders only last week, now runs neck and neck with all but one of them. (maristpoll.marist.edu)
Fresh discoveries have put two moons in our solar system neck and neck in the race. (newscientist.com)
Again, white really started running neck and neck with the popularity of black, spring 2015, so it's not unusual that we see it here again. (lmentsofstyle.com)