It is "Fore", not "four", hence not "five" either. The "Fore" comes from the old use of "Fore-caddies" who were down the fairway looking for the golfers ball coming down the fairway from the tee. The golfer would yell "Fore" telling the "Fore-caddie" that the ball was on the way. Now, of course, "Fore" means "Watch out! Ball is coming your way."
The call "Timber" is a warning that a tree is falling. Just as a golfer shouts" Fore" as a warning.
Call 'fore' if another Golfer is in danger.
The tradition is to warn other players by calling "Fore!"
A golfer could play out of turn, hit another person's ball , cheat , fail to yell FORE to warn others on the course of an oncoming drive shot.
search for a missing ball.
Four Pour Pout Port Pore Fore Fire Five
it arose by 1878 & perhaps as early as 1857 most likely in Scotland or perhaps England & probably as a contraction of before or else of fore caddie a fore caddie was a caddie who went before or ahead of a golfer to keep track of long shots & prevent lost balls
you have a hole in one
aday; fore say