What is the gutter in bowling?

Answer 1

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My answer:
The "gutter" in Bowling, is a term used to describe the two channels, one on either side of the bowling lane. If the bowl reaches the channel, a zero or "miss" is recorded for that shot. Even if the ball comes back out of the gutter at some point, it is still scored as a zero and the pins are reset.

Answer 2

The gutters are the shallow channels to the left and right of each bowling lane. In standard tenpin bowling, they are just over 9 inches wide, just under 63 feet long, and about 2 inches deep.

If the bowling ball goes into a gutter - even if it bounces back out onto the lane - the bowler gets a zero for that ball, and (if it was the first delivery of the frame) any pins that were knocked down must be set back up.