pest
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noun
a destructive insect or other animal that attacks crops, food, livestock, etc.:
害虫, 有害な小動物
e.g. the tomato plant attracts a pest called whitefly
e.g. an effective method for controlling insect pests
e.g. as modifier : pest control.
informal an annoying person or thing; a nuisance:
｟くだけて｠ 〖単数形で〗(主に子供をさして)やっかい者, 迷惑な人物, 問題児(nuisance)
e.g. he was a real pest.
(the pest) archaic bubonic plague.
｟古｠ ペスト, 悪疫
ORIGIN
late 15th century (denoting the bubonic plague): from French peste or Latin pestis ‘plague’.