Other forms: overdoses, overdosed, overdosing
An overdose is taking dangerously more of a medicine or drug than the body can handle. Too much, all at once.
It is a medical emergency and a clinical term, so hospitals record an overdose and the abbreviation OD is used in speech. It takes on or of. The word is also used loosely and lightly about anything excessive, so an overdose of daytime television is a joke rather than a diagnosis, and that use is common. As a verb it can be stressed on either syllable depending on whether it is noun or verb.
Proto-Indo-European
*deh₃-
Ancient Greek
δόσις — a portion prescribed
Latin
dosis
Middle French
dose
English
dose
English, today
overdose
Built from
From over- + dose. dose Middle French dose, from Latin dosis, from Ancient Greek δόσις (“a portion prescribed”) literally “a giving”, used by Galen and other Greek physicians to mean an amount of medicine, from δίδωμι (“to give”). Mostly displaced English drench. a doublet of doos.
Etymology from Wiktionary, CC BY-SA