Meaning of “overdose” - Learner’s Dictionary

overdose

noun [ C ] uk us /ˈəʊvədəʊs/

too much of a drug taken at one time:

Her daughter died of a drug overdose.
overdose uk us /ˌəʊvəˈdəʊs/ verb [ I ]

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