‘养肥’ literally combines 养 (yǎng, 'to raise' or 'to nurture') and 肥 (féi, 'fat' or 'fatty'), forming a compound verb meaning 'to fatten up'—typically referring to livestock such as pigs, chickens, or ducks raised for meat. It emphasizes the intentional, gradual process of increasing an animal’s weight through feeding and care before slaughter or market sale.

This term is used almost exclusively in agricultural, rural, or food-production contexts—not for people or pets (where it would sound inappropriate or even offensive). It carries a neutral, practical tone and appears frequently in farming manuals, news reports about livestock production, and conversations among farmers. While the characters individually have broader meanings, together they form a fixed, action-oriented collocation focused on animal husbandry outcomes rather than general growth or health.