The definition of a bypass is a secondary connection that goes around the main route or that provides an alternative means of arriving at a destination, or a surgical procedure designed to provide an alternative route.(noun)
To bypass is to provide an alternative way around, or to get around something.(verb)
If you take a shortcut to avoid traffic, this is an example of a time when you bypass traffic.
See bypass in Webster's New World College Dictionary
See bypass in American Heritage Dictionary 4
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