Where does “sideneck” come from?

sideneck (English) comes from English Side, from Middle English side, from Old English sīde, from Proto-West Germanic *sīdā, from Medieval Latin sida, from Late Latin seta, from Latin saeta, from Proto-Italic saitā — to satiate, satisfy.

Ancestry of “sideneck”, step by step

sideneck traces back through two separate lines of ancestry.

via English Side

StepLanguageWordMeaning
1EnglishSideA bounding straight edge of a two-dimensional shape
2Middle Englishsidecustom
3Old Englishsīdeside, flank
4Proto-West Germanic*sīdāside
5Medieval Latinsida
6Late LatinsetaAlternative form of saeta; hair, bristle; bristle
7Latinsaetaa bristle, hair on an animal; silk
8Proto-Italicsaitā
9Proto-Indo-Europeanséh₂ito-
10Proto-Indo-Europeansh₂ey-to bind, fetter
11Proto-Indo-Europeanseh₂-to satiate, satisfy

via English neck

StepLanguageWordMeaning
1EnglishneckThe part of the body connecting the head and the...
2Middle Englishnekkeneck
3Old Englishhneccaback of the neck; back of the head; neck
4Proto-West Germanic*hnakkōnape
5Proto-Germanichnakkôthe back of the neck; nape
6Proto-Indo-Europeanknog-back of the head, nape, neck
7Proto-Indo-Europeanken-to arise, begin
Every word from Proto-Indo-European seh₂-Every word from Proto-Indo-European sh₂ey-Every word from Proto-Indo-European séh₂ito-