Meaning 1 ►▼
The football game is almost over. The quarterback of the team is desperate. He tries at the last minute a very long pass, a Hail Mary pass.
The Dallas quarterback tried a 50 yard pass, a Hail Mary pass, hoping he could tie up the game.
Meaning 2 ►▼
A politician or say a business man or woman decides he is about to lose an election or an account and has a desperate strategy to get back "into the game," a Hail Mary pass.
Many commentators and the electorate thought Mitt Romney's choice of Paul Ryan as candidate for vice-presidential spot on the 2012 Republcan ticket was a Hail Mary pass.