English definition of “guard”
PROTECT [C] › someone whose job is to make certain someone does not escape or to protect a place or another person: a security guard prison guards
SOLDIERS [no plural] › a group of soldiers or police officers who are protecting a person or place
TRAIN [C] (also conductor) › someone who is in charge of a train
THING [C] › something that covers or protects someone or something: a fire guard
be on guard; stand guard › to be responsible for protecting a place or a person: Armed police stood guard outside the house.
be under guard › to be kept in a place by a group of people who have weapons: The suspect is now under guard in the local hospital.