all together; everyone turning out
Used when all members of a group participate or appear together, often in phrases like 総出で or 総出の.
家族総出で庭の掃除をした。
The whole family turned out to clean the garden.
All the villagers are working together to prepare for the festival.
Compound of 総 (all, whole) and 出 (going out, appearing). The exact historical derivation is uncertain, but the meaning is transparent from its components.