例えば、 It isexpedientthat you change the plan. という使い方がありました。
意味は、 appropriate to a purpose、 useful or advantageous in a given situation で、目的の達成に役立つ、当を得た、でしたね。
思い出しましたか?
【Bon appétit !】
The Battle of Normandy during WWII was fought between the German forces occupying Western Europe and invading Allied forces. It remains the largest amphibious(上陸作戦の、水陸両用の)landing in history, with more than 156,000 troops crossing the English Channel during the initial invasion. The battle continued for more than 2 months and concluded with the liberation of Paris. Of the invasion's 5 coastal landing points, Omaha Beach proved to be the most disastrous for Allied troops.