Sports. being beyond or passing the limits or boundaries of a field, course, etc., marking the area within which the ball, puck, or the like is legally in play.
beyond any established boundaries or prescribed limits; prohibited; forbidden.
further than or beyond established limits, as of behavior or thought.
Origin of out-of-bounds
First recorded in 1855–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019