0 over the side of a boat and into the water -- por la borda
to fall overboard
1 into the water from a boat -- por la borda
Someone pushed him overboard. Alguien le empujó por la borda.
2 to do or say more than is acceptable or needed -- pasarse (tres pueblos)
Some of the fans went overboard and started throwing things. Algunos de los fans se pasaron tres pueblos y comenzaron a tirar cosas.