Perhaps they're a dime-a-dozen because they go unchallenged? I've had junior members of staff express genuine surprise when I've corrected such mistakes in doc

Perhaps they're a dime-a-dozen because they go unchallenged? I've had junior members of staff express genuine surprise when I've corrected such mistakes in documents. It's a difficult thing to do without offense, but when clear meaning is imperative there's no leeway for doubt. In 20 years time, will people still understand today's silly idioms or try to read them literally? "Nip it in the butt!"