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.

(law enforcement) An armed person working to provide order, security, discipline, punishment, and prevent escapes of prisoners in a jail that answers to a warden.

plural of guard dog

Alternative form of guard dog

The guard or defence of a castle. / (UK, law, obsolete) A tax or imposition on a dwelling within a certain distance of a castle, for the purpose of maintaining watch and ward in it; castleward.

A covering or protection for a haystack, such as a canvas.

(radio) An unused part of the radio spectrum between bands, for the purpose of preventing interference.

a member of the British ruler's personal guard.

plural of guard post

A location where a guard is posted (station), often having a guardhouse.