Meaning of PEST in English

PEST

pest /pest/ BrE AmE noun [countable]

[ Date: 1500-1600 ; Language: French ; Origin: peste 'plague' , from Latin pestis ]

1 . a small animal or insect that destroys crops or food supplies ⇨ vermin :

a chemical used in pest control

2 . informal an annoying person, especially a child

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.