pest

bug, insect, pest, worm

名词 pest:

1. 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
   同义词：plague, pestilence, pestis
2. any epidemic disease with a high death rate
   同义词：plague, pestilence
3. a persistently annoying person
   同义词：blighter, cuss, pesterer, gadfly
4. any unwanted and destructive insect or other animal that attacks food or crops or livestock etc.

1. That child is an absolute pest!
   那孩子讨厌极了！
2. Stores of grain are frequently attacked by pests.
   储存的谷物经常受到害虫的破坏。

pest

n.（名词）
An annoying person or thing; a nuisance.
讨厌的人或麻烦事；妨碍
An injurious plant or animal, especially one harmful to human beings.
有害动植物：有害的植物或动物，尤指那些对人类有害的
A deadly epidemic disease; a pestilence.
瘟疫：一种致命的传染病；瘟疫

来源：
French peste [pestilence]
法语 peste [瘟疫]
from Old French
源自 古法语
from Latin pestis
源自 拉丁语 pestis