Hail Mary (n. or adj.)

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HAIL MARY (n.)
HAIL MARY (n.)

What does the idiom “hail Mary” mean?

Definition: A desperate, last-ditch attempt

Example: The ruling party is going to make one more hail Mary attempt to pass a tax increase, even though it’s failed twice.

Note: This expression comes from American football and is North American. It is now used in contexts outside sports.