noun
large household; large family
Refers to a household with many family members living together, often implying a busy, crowded domestic situation.
彼女は大所帯の主婦として毎日忙しくしている。
She is busy every day as the homemaker of a large household.
大所帯だと食費だけでも大変だ。
With a large family, just the food expenses are tough.
noun
large group; big organization
Used for any sizable group of people, such as a company department, a sports team, or a project team, emphasizing the number of members.
新しい部署は大所帯で、50人以上いる。
The new department is a large group, with over 50 people.
大所帯のチームをまとめるのは大変だ。
Managing a large team is tough.
noun
Rare, somewhat old-fashioned use referring to substantial financial assets or a fortune. Modern Japanese more often uses 巨額の富 or 大きな財産.
彼は一代で大所帯を築いたと言われる。
He is said to have built a great fortune in one generation.
Compound of 大 (large) + 所帯 (household). 所帯 itself originally referred to a household or family unit. The spelling 大世帯 uses 世 (world/generation) as a variant, but 大所帯 is the established form.