A single girl (or, rarely, a boy), usually a foreigner, who helps a host family with childcare, housework, or both while staying as a guest with a host family, and generally receives a small allowance (or pocket money).

Naturally. / In the plainest or simplest manner. / In the nude: in the naked state. / Without makeup and with one's natural hair color.

Being familiar with or informed about something.

(usually humorous, emphatic) on the contrary

(cooking) Covered with a crust of breadcrumbs (and often cheese) then browned under a grill.

deep down, in the end

plural of au pair

(humorous) Au revoir.

(proscribed) Jus: a gravy served in or with a meat dish and made from its juices.

(cooking, of meat, postmodifier) Prepared or served in or with gravy made from its own juices.