Quo is not generally in standard use by itself because its meaning of "quoth" is archaic. It pairs well with other words, however. These quo meanings include quid pro quo, quo vadis, quo animo, and quo warranto. Quid pro quo means to expect something in return for doing something else, such as, "If you rake my leaves, I'll paint your shed." Quo vadis means, "Where are you going?" Quo animo asks about someone's intentions while quo warranto indicates a hearing to determine the particular authority that grants an office or license. When used by itself, it stands in for other words in quotations. Perhaps the most famous example of a quo definition would be the modified phrase, "Quo the Raven, nevermore."