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From The Collaborative International Dictionary of English v.0.48:
Trench \Trench\, v. t. [imp. & p. p. Trenched; p. pr. & vb. n. Trenching.] [OF. trenchier to cut, F. trancher; akin to Pr. trencar, trenchar, Sp. trinchar, It. trinciare; of uncertain origin.] 1. To cut; to form or shape by cutting; to make by incision, hewing, or the like. [1913 Webster] The wide wound that the boar had trenched In his soft flank. --Shak. [1913 Webster] This weak impress of love is as a figure Trenched in ice, which with an hour's heat Dissolves to water, and doth lose its form. --Shak. [1913 Webster] 2. (Fort.) To fortify by cutting a ditch, and raising a rampart or breastwork with the earth thrown out of the ditch; to intrench. --Pope. [1913 Webster] No more shall trenching war channel her fields. --Shak. [1913 Webster] 3. To cut furrows or ditches in; as, to trench land for the purpose of draining it. [1913 Webster] 4. To dig or cultivate very deeply, usually by digging parallel contiguous trenches in succession, filling each from the next; as, to trench a garden for certain crops. [1913 Webster]