Think of the last few seconds of a football game. Your team is behind, and there is no time for a careful plan. So the ball goes up as high and as far as it can, toward a crowd of people at the other end of the field. Everyone watches it fall. Nobody can steer it any more.
球場上的最後幾秒：落後、時間快歸零，已經來不及好好布局。於是球被用力往前一丟，飛向遠遠那一端的人群。所有人只能抬頭看著它掉下來，沒有人再能控制它。這個詞的重量不在「丟得遠」，而在「丟出去之後就只能等」。
From the word’s history
Hail Mary is a prayer asking Mary to help; the name says the throw is no longer a plan but a hope. The phrase is recorded from the 1970s in American football.
Hail Mary 是天主教向聖母瑪利亞求助的禱告詞，來自拉丁文 Ave Maria。把它放在 pass 前面，等於說這一傳已經不是戰術，而是祈禱。資料記載這個說法從 1970 年代的美式足球場開始使用。
Wiktionary, "Hail Mary pass"
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