The person in the most prominent position on something, such as a spokesperson or manager. / One who goes ahead of a group in order to indicate the direction in which it should move.

(informal, often derogatory) A transsexual person, especially a trans woman; (loosely) a drag queen or transvestite.

Obsolete spelling of bustle

Propulsion that is caused by the expulsion of a jet of fluid, especially by a jet engine / The study of devices propelled by jet propulsion