the.com/overdose

means To take too much of a drug or medication, enough to cause serious harm or death.

from Straightforward carpentry of a word: 'over' plus 'dose,' with 'dose' itself borrowed from Greek 'dosis,' meaning 'a giving' or 'a portion given' — originally a medical term for the measured amount of medicine a patient should take. Once doctors had a word for the right amount, it was only a matter of time before English needed one for too much of it, a sense that solidified as pharmacology became more exact about what a safe portion actually was.