1. To cut; to form or shape by cutting; to make by incision, hewing, or the like. The wide wound that the boar had trenched In his soft flank. Shak. 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. 2. (Fort.) To fortify by cutting a ditch, and raising a rampart or br...