
Stream capture, river capture, or stream piracy is a geomorphological phenomenon occurring when a stream or river drainage system or watershed is diverted from its own bed, and flows instead down the bed of a neighbouring stream. This can happen for several reasons, including: The additional water flowing down the capturing stream may accelerate e...
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http://en.wikipedia.org/wiki/Stream_capture

(from the article `river`) ...In most cases, erosion was accomplished by the same river that occupies the valley bottom, although sometimes rivers are diverted from one valley ... A river system of appreciable size is likely to have undergone considerable changes in drainage area, network pattern, and profile and channel ... ...the f...
Found on
http://www.britannica.com/eb/a-z/s/170

see stream piracy.
Found on
https://www.encyclo.co.uk/local/22327

piracy (def. 3).
Found on
https://www.infoplease.com/dictionary/stream-capture
No exact match found.