Meaning of “spill out” - Learner’s Dictionary

spill out

phrasal verb with spill uk us /spɪl/ verb [ T ] (past tense and past participle spilled, also UK spilt)
FALL

to flow or fall out of a container:

The contents of the truck spilled out across the road.
MOVE

If people spill out of a place, large numbers of them move out of it:

The crowd spilled out onto the street.

(Definition of “spill out” from the Cambridge Learner’s Dictionary © Cambridge University Press)