From Middle English under-, from Old English under-, from Proto-West Germanic *undar, from Proto-Germanic *under, from Proto-Indo-European *(H)n̥dʰér (“below”) and *h₁n̥tér (“inside”). For more, see under.
Ćwicz mówienie i zapamiętywanie " under- " i wielu innych słów i zdań z angielski .