An otter species, Lutra lutra.

(medicine) The study of diseases of the ear, nose and throat.

(British) A formulaic name that is substituted for that of a person whose name or identity is not known, or not relevant; typically used when exhibiting an example.

(informal) A woman who is romantically involved with someone (usually a man) already in a committed relationship with another woman, especially a woman having an affair with a married man.

(fandom slang) One with an obsessive interest in something, particularly (originally derogatory) obsessive Japanese fans of anime or manga.

The same but with the things or people mentioned in reverse order.

The same but with the mentioned things or people in reverse order or position. / In reversed orientation.

(idiomatic) To have more important things to do.

plural of otaku

(idiomatic) The roles of people in a situation have been reversed, such that the advantage has shifted to a party which was previously disadvantaged.