What is the meaning of plague?

noun

• A serious (sometimes fatal) infection of rodents caused by Yersinia pestis and accidentally transmitted to humans by the bite of a flea that has bitten an infected animal.
  • synonyms: pestilence, pest, pestis
• Any epidemic disease with a high death rate.
  • synonyms: pestilence, pest
• A swarm of insects that attack plants.
  • usage: "a plague of grasshoppers"
  • synonyms: infestation
• Any large scale calamity (especially when thought to be sent by God. )
• An annoyance.
  • usage: "those children are a damn plague"

verb

• Cause to suffer a blight.
  • usage: "Too much rain may blight the garden with mold"
  • synonyms: blight
• Annoy continually or chronically.
  • usage: "He is known to harry his staff when he is overworked"; "This man harasses his female co-workers"
  • synonyms: harass, hassle, harry, chivy, chivvy, chevy, chevvy, beset, molest, provoke