As a pronoun yours
is that which belongs to you (singular); the possessive second-person singular pronoun used without a following noun.
As a noun sours is
As a verb sours is
That which belongs to you (singular); the possessive second-person singular pronoun used without a following noun.
That which belongs to you (plural); the possessive second-person plural pronoun used without a following noun.
*:“Heavens!” exclaimed Nina, “the blue-stocking and the fogy!—and yours are'' pale blue, Eileen!—you’re about as self-conscious as Drina—slumping there with your hair tumbling ''à la Mérode! Oh, it's very picturesque, of course, but a straight spine and good grooming is better.”
* In British English the adverb almost invariably follows the word yours'' at the end of a letter; in most dialects of American English it usually precedes it. As a general rule, ''sincerely'' is only employed if the name of the recipient is already known to the writer; a letter begun with ''Dear Sir'' or ''Dear Madam'' finishes with ''faithfully''. ''Yours'' on its own and ''yours ever are less formal than the other forms.
* up yours
* what's yours
* you'll get yours
* yours truly
* you scratch my back and I'll scratch yours