Where does “kill off” come from?

kill off (English) comes from English kill, from Middle English killen, from Old English cwellan, from Proto-West Germanic kwalljan, from Proto-Germanic kwaljaną, from Proto-Germanic -janą, from Proto-Indo-European -yéti, from Proto-Indo-European yé- — he, she.

kill off (English): To eliminate, or make extinct; To take a...

Definitions

  1. To eliminate, or make extinct; To take a...

Ancestry of “kill off”, step by step

kill off traces back through two separate lines of ancestry.

via English kill

StepLanguageWordMeaning
1EnglishkillTo put to death; to extinguish the life of; To...
2Middle Englishkillen
3Old Englishcwellanto kill; to slay
4Proto-West Germanickwalljanto make suffer, to hurt
5Proto-Germanickwaljanąto make suffer, to hurt
6Proto-Germanic-janąDerives denominatives from nouns and factitives...
7Proto-Indo-European-yétiCreates intransitive, often deponent,...
8Proto-Indo-Europeanyé-
9Chichewaiyehe, she

via English off

StepLanguageWordMeaning
1EnglishoffIn a direction away from the speaker or object;...
2Middle Englishofof; off; until
3Old Englishofof, from, off, out of
4Old Englishæfof
5Proto-Germanic*ab
6Proto-Indo-Europeanapó
Every word from Chichewa iyeEvery word from Proto-Germanic -janąEvery word from Proto-Indo-European -yéti