Mulligan

Etymology
The unit of measure sense is from that quantity's often being the amount a person must drink if taking a do-over in a drinking game.

Noun

 * 1) Mulligan stew.
 * 2)   An unpenalized chance to re-take a stroke that went awry.
 * If you lose your drive in the water, take a mulligan and try again.
 * 1) A second chance.
 * Don't do poorly in your first interview; you won't get a mulligan.
 * 1)  A unit of measure equal to 62.5 milliliters, or 2.5 shots, of alcohol.
 * Tom couldn't handle the shot of tequila, so he had to do a mulligan of port.

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