Hail Mary noun 2verb 1forms 4 noun2 •A prayer, of established or conventional wording, calling for the intercession of the Virgin Mary.And if I say ten Hail Marys / Leave a light on in Heaven for me — 1987 •[before a noun] (US, figurative) A risky last-ditch effort with great benefit but little chance of success; one whose success would require divine intervention; a Hail Mary pass.Silk Road was, in some sense, a last heave—a Hail Mary in the parlance of Ross's football-mad hometown. — 2015 verb[with oneself]1 •To pray by saying a Hail Mary.He Hail Maryed himself to sleep every night and woke up Hail Marying in the morning, and to his amazement and delight it worked. — 2003 formsHail Maryed · Hail Marying · Hail Marys · Hail Maries