noun
large household; big family
Refers to a household with many members, often implying a bustling, extended family. The variant spelling 大所帯 is also common.
See also: 大所帯
祖母は大世帯を切り盛りしてきた。
My grandmother has managed a large household.
大世帯だと食費もかさむ。
With a big family, food expenses add up.
大家族 focuses on the family unit itself (extended family), while 大世帯 emphasizes the household as a living and economic unit.
Compound of 大 (large) and 世帯 (household). The variant 大所帯 uses 所 (place) instead of 世 (generation/world), but both refer to a large domestic unit.