IPA: /ˈbiːfiər/
KK: /ˈbifi/
Having a strong, muscular, or well-built appearance; larger or more substantial than average.
After months of training, he looked beefier than ever before.
Comparative: beefier
Superlative: beefiest
Beefier → It is formed from "beef" (from Old French *beuf*, meaning meat from a cow) and "-ier" (a suffix used to form adjectives indicating a comparative degree). The word "beefier" means having more beef or being more substantial in terms of meatiness.
Think of 'beef' as the meat from a cow, and the '-ier' suffix indicates a comparison, so 'beefier' means more like beef or more substantial.