Where does “undergrown” come from?

undergrown (English) comes from English under, from Middle English under, from Old English under, from Proto-Germanic under, from Proto-Indo-European h₁entér, from Proto-Indo-European h₁en — in; in, inside.

undergrown (English): insufficiently grown; not having grown to a...

Definitions

  1. insufficiently grown; not having grown to a...

Ancestry of “undergrown”, step by step

undergrown traces back through two separate lines of ancestry.

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

via English grown

StepLanguageWordMeaning
1Englishgrownpast participle of grow; Covered by growth;...
2Middle EnglishgrowenTo grow usually of plants, fruit, etc
3Old Englishgrōwanto grow, increase, flourish, germinate
4Proto-Germanicgrōanąto green; to grow
5Proto-Indo-Europeanǵʰreh₁-to become green, grow; to grow; to green, to grow
Every word from Proto-Indo-European h₁enEvery word from Proto-Indo-European h₁entérEvery word from Proto-Germanic under