Where does “underreaction” come from?

underreaction (English) comes from English reäction, from Middle English reaccion, from Old French reaction, from Latin reactio, from Latin reago, from Latin rĕ-, from Latin prōdūcō, from Latin prō- — passed , crossed.

underreaction (English): A reaction that is inadequate or insufficient

Definitions

  1. A reaction that is inadequate or insufficient

Ancestry of “underreaction”, step by step

underreaction traces back through two separate lines of ancestry.

via English reäction

StepLanguageWordMeaning
1EnglishreäctionRare spelling of reaction
2Middle Englishreaccionreaction
3Old Frenchreaction—
4Latinreactioreaction
5LatinreagoI act upon again, I do again; I react
6Latinrĕ-back, backwards
7Latinprōdūcōto lead or bring forth, forward or out
8Latinprō-forward direction, forward movement
9Proto-Italic*pro-pro- see the Latin entry for further meanings
10Proto-Indo-Europeanpro-toward, forward
11Proto-Indo-Europeanpor-to give birth; forward, through; going, passage
12Proto-Indo-Europeanper-before, in front; first; to go through
13Proto-Indo-Europeanpr̥tóspassed , crossed

via English under

StepLanguageWordMeaning
1EnglishunderIn or at a lower level than; As a subject of;...
2Middle Englishunderunder
3Old Englishunderunder, beneath
4Proto-Germanicunderamong, between; under, beneath; under
5Proto-Indo-Europeanh₁entérbetween
6Proto-Indo-Europeanh₁enin; in, inside
Every word from Proto-Indo-European pr̥tós →Every word from Proto-Indo-European per- →Every word from Latin rĕ- →