1 pour (out or over), overflow, slop or run or brim over:
The milk spilt all over the floor.
2 waste, throw out, lose:
Don't cry over spilt milk.
3 spill the beans. reveal or tell or disclose or divulge all or everything, blab, tattle, let the cat out of the bag, confess, Slang squeal, be a stool-pigeon or stoolie, spill one's guts, sing (like a canary), Brit blow the gaff:
Finnegan spilled the beans to the cops.
4 outpouring, flood, leak, leakage:
Don't tell me there's been another oil spill!
5 fall, tumble, accident, Colloq cropper, header:
Crutchley had a nasty spill at the third fence in the Grand National.