retrench

verb

Etymology: Etymology tree Proto-Italic *wre- Latin re-der. Old French re-bor. Middle English re- English re- English trench English retrench From re- + trench.

1. To dig or redig a trench where one already exists.

   “The [fishing] technique was to clear the channel downstream from the lagoon for about twenty to forty yards, but not all the way to the salt water. A small "bridge" was left at the lower end of the lagoon. When holding pits had been dug near the end of the re-trenched channel and everyone was ready, the "bridge" was dug out and the outrush of water brought hundreds of fish along with it.”