What is a Big 4 in Bowling?

Answer 1

First Response:

The big four.

Second Response:

The big four is a split consisting of the 4-6-7-10 pins. It is difficult because they are setup up with two on each side of the lane and are the furthest pins apart.

Answer 2

The Big 4 is a split where the 4-6-7-10 pins are left standing after the first ball.