Where does “Sl” come from?

Sl (Japanese) comes from English steam locomotive, from English locomotive, from French locomotif, from Vulgar Latin motivus, from Latin motus, from Latin movere, from Latin moveo, from Proto-Italic moweō — to move.

Ancestry of “Sl”, step by step

StepLanguageWordMeaning
1Englishsteam locomotiveA locomotive, usually for use on a railway, that...
2EnglishlocomotiveThe power unit of a train that pulls the coaches...
3Frenchlocomotiflocomotive
4Vulgar Latinmotivusmoving; stirred; moved
5Latinmotusmoved, stirred, disturbed, having been moved;...
6Latinmoverepresent active infinitive of moveō; second-person...
7LatinmoveoI move, stir, set in motion; I disturb, shake,...
8Proto-Italicmoweōto move
9Proto-Indo-Europeanmew-to move
Every word from Proto-Indo-European mew-Every word from Proto-Italic moweōEvery word from Latin moveo