Noun
(American football) A long forward pass with little chance of completion, typically used by the losing team when time is running out and no other play is practical, in a desperate attempt to score the winning points.
(by extension) An act done in desperation, with only a very small chance of success.
Source: en.wiktionary.orgHuerta called their saving move a "Hail Mary pass." Source: Internet
It was always going to be a Hail Mary pass to get the climate science-, environmental safeguard- Trump administration to agree to language supporting the Paris climate accord. Source: Internet
For most of them, the 1,700-student school is a desperate, Hail Mary pass to playing football at a four-year school, and building a better future. Source: Internet