Meaning of “breathalyser” - Learner’s Dictionary

breathalyser

noun [ C ] uk /ˈbreθəlaɪzər/ UK

a piece of equipment that tests your breath to measure how much alcohol you have had

breathalyse verb [ T ] UK

to measure the alcohol in someone's body using a breathalyser

(Definition of “breathalyser” from the Cambridge Learner’s Dictionary © Cambridge University Press)