“The employees’ salaries were increased across the board.”
This means that all the employees got a raise. The board in “across the board” was originally a board displaying the odds for betting on horse races. The term “across the board” included the case of the horse winning first, second or third place.
「全ての社員が昇給した。」
Across the boardのboardは、元々は競馬のオッズを表示する掲示板でした。1位、2位、3位の全てに一度に賭ける場合を言います。
