guardguardguards1nounpronunciationThe word guard sounds just like the beginning of the word garden.1a person who keeps somebody or something safe from other people, or who stops somebody from escaping: There are security guards outside the bank. The soldiers were on guard outside the palace (= guarding the palace).2(British) (Americanconductor)a person whose job is to look after people and things on a trainbe on your guardto be ready if something bad happensguardguardguardsguardedguarding2verb (guards, guarding, guarded)to keep somebody or something safe from other people, or to stop somebody from escaping: The house was guarded by two large dogs.