Synonyms of guard in English:

guard

verb

  • 2 the prisoners were guarded by armed men
    keep under surveillance, keep under guard, keep watch over, surveil, mind
  • 3 forest wardens must guard against poachers
    beware of, keep watch for, be alert to, keep an eye out for, be on the lookout for, be on the alert for

noun

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  • 4 a metal guard
    safety guard, safety device, protective device, shield, screen, fender; bumper, buffer

Phrases

off (one's) guard

the explosion from the furnace room caught everyone off guard unpreparedunreadyinattentiveunwarywith one's defenses downcoldunsuspecting informalnappingasleep at the wheel

on one's guard

homeowners should be on their guard vigilantalerton the alertwarywatchfulcautiouscarefulheedfulcharycircumspecton the lookouton the qui viveon one's toespreparedreadywide awakeattentiveobservantkeeping one's eyes peeled

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