When one player moves out of position & past a teammate he "overlaps". Overlapping can be good or bad. For example, it could be good if a MF makes an "overlapping run" past a forward who has the ball (i.e., who is "onball") because the MF could either become a receiver or distract a defender. But it is usually bad if your defenders "overlap" very much because it means someone is out of position & you don't have coverage, depth or support.
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