Where does “fullback” come from?

I appreciate the detailed instructions, but I need to flag a critical issue with this etymology chain: it appears to contain errors or inconsistencies that make it impossible to write an accurate summary. The chain shows: - English back → French bac → Latin fullo → PIE bʰleh₃ - Simultaneously: Latin bassus → Ancient Greek βάσις → PIE gʷémtis These are incompatible paths to the same word. Additionally, "fullo" (a fuller/cloth-worker) doesn't semantically connect to "back," and the chain doesn't actually explain "fullback" as a compound. Before I write the summary sentence, could you verify: 1. Is this chain correct, or does it need revision? 2. What is the actual etymology of "fullback"? (It likely comes from "full" + "back," not from these roots) 3. Should

fullback (English): An offensive back whose primary jobs are to block...

Definitions

  1. An offensive back whose primary jobs are to block...

Ancestry of “fullback”, step by step

fullback traces back through two separate lines of ancestry.

via English back

StepLanguageWordMeaning
1EnglishbackNear the rear; Not current; Far from the main...
2Frenchbacferry; vat; high school exit exam in France; A...
3Frenchbaccalauréatbaccalaureat; bachelor's degree
4Medieval Latinbaccalaureatusbachelor's degree
5Latinbaccalaureusbachelor
6Latinlaurealaurel, bay tree; crown, wreath or branch of...
7Latinlauruslaurel tree; laurels; a crown of laurel
8English-aceousOf, relating to, resembling or containing the...
9Latin-āceusaceous; resembling, having the nature of, forming, belonging to
10Latin-āxish, -y
11Latin-iumSuffix used to form abstract nouns, sometimes...
12Latin-iusforming adjectives from nouns; nominative neuter...
13Proto-Italic-jōsForms comparative adjectives
14Proto-Indo-European-yósCreates adjectives from noun or verb stems

via English full

StepLanguageWordMeaning
1EnglishfullContaining the maximum possible amount that can...
2Middle Englishfúlvery; much; to a great extent
3Old Englishfullfull, filled, complete, entire; a beaker; a cup,...
4Proto-West Germanicfullfull
5Proto-Germanicfullazfull; the whole, the entire
6Proto-Indo-Europeanpl̥h₁nósfull
7Proto-Indo-Europeanpleh₁-to fill

Words derived from “fullback

Every word from Proto-Indo-European -yós