Where does “jam-packed” come from?

jam-packed (English) comes from English JAM, from Urdu جامہ, from Persian جامه, from Middle Persian yʾmk', from Proto-Iranian *yām-, from Proto-Indo-Iranian Yámas, from Proto-Indo-European *yém-o-s.

jam-packed (English): Packed or filled tightly; simple past tense and...

Definitions

  1. Packed or filled tightly; simple past tense and...

Ancestry of “jam-packed”, step by step

jam-packed traces back through two separate lines of ancestry.

via English JAM

StepLanguageWordMeaning
1EnglishJAMA household that is only barely able to meet its...
2Urduجامہgarment; robe; gown
3Persianجامهa garment, robe, vest, gown, coat
4Middle Persianyʾmk'
5Proto-Iranian*yām-
6Proto-Indo-IranianYámas
7Proto-Indo-European*yém-o-s

via English packed

StepLanguageWordMeaning
1Englishpackedsimple past tense and past participle of pack;...

Words derived from “jam-packed

Every word from Proto-Indo-European *yém-o-sEvery word from Proto-Indo-Iranian YámasEvery word from Proto-Iranian *yām-