A person who routinely inhales and exhales through the mouth, instead of through the nose. / (idiomatic, slang, derogatory) A person who is boorish, stupid, or otherwise unattractive.

A well-known public discourse given by Jesus in the first year of his ministry, around 30 C.E..

A subspecies of reindeer, found wild in southern Norway and Kola peninsula in Russia; Rangifer tarandus tarandus. A semi-domesticated variant is widely herded by the Sami in northern Scandinavia.

(slang) To make reckless or exaggerated statements.

(idiomatic, US) To be careful about what one says, especially with regard to disrespectful or profane language.

(humorous) One who does not speak can be sure of not saying anything embarrassing.

foot-and-mouth disease

That is pleasing to the sense of taste; appetizing. / (by extension) Enticing or tantalizing.

The property of being mousy.

(medicine) Altitude sickness.