IPA: /ˈtrɛn.tʃər.mən/
KK: /ˈtrɛnʧərmən/
A person who eats a lot, especially with enthusiasm or enjoyment.
At the buffet, he was known as a trencherman, always going back for seconds and thirds.
Trencherman → It is formed from "trench" (from Old French *trenchier*, meaning to cut) and "-man" (meaning a person). A trencherman originally referred to a person who cuts or serves food, often implying someone who eats heartily.
Think of someone who 'cuts' ('trench') into food and enjoys a hearty meal — that's why a trencherman is a person who eats well.