Where does “bootleg” come from?

I can't write an accurate etymology sentence for this entry because the chain provided only cycles through "English leg" and "English bootleg" repeatedly without showing any origin language or historical development before English. A valid etymological chain requires at least one pre-English source language to explain how the word came into English. Could you provide the complete chain starting from the earliest attested source?

bootleg (English): To make, transport and/or sell illegal alcoholic...

Definitions

  1. To make, transport and/or sell illegal alcoholic...

Ancestry of “bootleg”, step by step

bootleg traces back through two separate lines of ancestry.

via English boot

StepLanguageWordMeaning
1EnglishbootA heavy shoe that covers part of the leg; A blow...
2Frenchbotteboot; something resembling a boot; oppression
3Italianbottablow, hit, shock, knock, attack
4Italianbottare
5Frenchbouterto push; to remove flesh from the skin of an...
6Middle Frenchbouterto pull
7Old Frenchbouterto strike; to hit; to place; to put; to enter
8Frankishbautanto push, strike, beat; to hit, strike; to hit,...
9Proto-West Germanicbautanto beat
10Proto-Germanicbautanąto beat, push
11Proto-Indo-Europeanbʰewd-to hit, strike; to beat, push; to strike, push,...
12Proto-Indo-Europeanbʰew-to grow, swell; to swell, wax, grow; to blow; to...

via English leg

StepLanguageWordMeaning
1EnglishlegA limb or appendage that an animal uses for...
2Middle Englishlegleg, limb; shank, shin; leg
3Old Norseleggrleg, stem
4Proto-Germaniclagjazleg, thigh
5Proto-Indo-European(ǝ)lak-

Words derived from “bootleg

Every word from Proto-Indo-European bʰew-