Full of guile; treacherously deceptive.

A rail set alongside a dangerous place as a barrier, to improve safety. / (figuratively, by extension) Any barrier designed to prevent accidents or mistakes.

A person, especially a soldier, who is on guard. / (US) A member of the National Guard. / (Britain) A member of a Guards regiment.

Free from guile; honest but naive.

A book that provides guidance, but especially one designed for travellers which provides local tourist information about a particular country or area.

Alternative spelling of advance guard

A unit or units leading the way of advancing or marching troops, guarding them from ambushes, reconnoitering and pursuing the enemy, etc. / An individual soldier in the same role.

A book, magazine or website that lists the television schedule. / An interactive menu-based system displaying the television schedule on the television screen.

plural of guide dog

(fencing) The starting position of a fencing bout; en garde. / Vigilant, alert. / (aviation) Transmitting on the aircraft emergency frequency.