IPA: /ˈbɛn.tʃər/
KK: /ˈbɛnʧər/
A person who sits on a bench, often in a legal context, such as a judge or magistrate.
The bencher presided over the court proceedings with great authority.
Bencher is formed from "bench" (from Old English "benc", meaning a long seat or work surface) and "-er" (meaning a person who). A bencher is a person associated with a bench, often referring to someone who sits on a bench or a member of a governing body in a legal context.
Think of a 'bench' as a long seat where someone might sit, and the '-er' indicates a person. So, a bencher is simply a person who is associated with or sits on a bench.