underbrewer means an apprentice brewer learning the brewing craft and trade from a chief brewer. Lexicurio rates it Sui generis — a strength score of 100 out of 100.
Etymology
From under- + brewer.
noun
- An apprentice brewer learning the brewing craft and trade from a chief brewer.“In 1930 de Bavay resigned as brewer manager. Carl Stefanson, the under-brewer, took his place.”