The act of putting someone into an apprenticeship, or serving as an apprentice while learning a trade.
From 'apprentice' (noun/verb) plus the gerund/participle suffix '-ing'. The verb form emerged in English around the 1400s as the apprenticeship system became formalized in trade guilds.
Apprenticing was literally how most medieval Europeans learned anything practical—there were no schools for blacksmithing or carpentry, so entire economies depended on this one-on-one skill transfer method.
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