Definition
This idiom is used to warn someone that they will become uninteresting if they only work and never take time to relax.
I've been working non-stop lately, without any rest. I need to remember the saying 'all work and no play makes Jack a dull boy'.
He spends all day in the office, no wonder he looks so tired. Remember, 'all work and no play makes Jack a dull boy'.
I know you’re eager to finish this project, but don’t let yourself become all work and no play. Remember ‘all work and no play makes Jack a dull boy’.