guard Noun a person (or thing) who protects or watches over something
guard Noun A squad responsible for protecting something.
guard Noun a part of a machine which blocks access to dangerous parts
guard Noun panel of a car which encloses the wheel area, especially the front wheels.
guard Noun A relatively short player, playing farther from the basket than a forward or center.
guard Noun The position on the popping crease where a batsman makes a mark to align himself with the wicket (see to take guard)
guard Noun The offensive positions between the center and each of the offensive tackles. The main responsibilities of the guard is to protect the quarterback, and open up "holes" through which offensive players can run. There are two guards on the field at once.
guard Noun A player playing a position named guard
guard Noun (railways) An employee who normally travels in the last vehicle of a train and is responsible for the safety of the train
guard Verb To protect from some offence (specific or abstract.)