one final word
The last comment or criticism one has to say (about something or to someone). I just have one final word about your proposal that I think would improve things greatly. One final word, Tom—if you ever try something like that again, I'll make sure you never work in this industry again.
one final word
and one final thingFig. a phrase introducing a parting comment or the last item in a list. John: One final word—keep your chin up. Mary: Good advice! And one final thing, don't haul around a lot of expensive camera stuff. It just tells the thieves who to rob.