Any of a number of plants such as sagebrush considered to be similar to Salvia officinalis, mostly because they are small shrubs and have gray foliage or are aromatic.
Interjection
(Internet slang) Word used in the email field of imageboards to prevent a bump of the post. Used as an option rather than a word in some imageboard software.
Verb
(Internet slang) The act of using the word or option sage in the email field or a checkbox of an imageboard when posting a reply.