IPA: /ˈtoʊstˌmæs.tər/
KK: /ˈtoʊstˌmæs.tɚ/
A person who leads a formal gathering, especially at a banquet, by proposing toasts and introducing speakers.
The toastmaster kept the event lively by sharing funny stories and introducing each speaker with enthusiasm.
Toastmaster → It is formed from "toast" (from Old French *toster*, meaning to toast or brown) and "master" (from Old English *maegester*, meaning one who has control or authority). A toastmaster is someone who presides over a gathering, often leading toasts and speeches.
Think of someone who 'toasts' (browns) and is a 'master' (one in control) of the event — that's why a toastmaster leads the toasts.