sub·merge / səbˈmərj/ • v. [tr.] (usu. be submerged) cause to be under water: houses had been flooded and cars submerged. ∎ [intr.] descend below the surface of an area of water: the U-boat had had time to submerge. ∎ completely cover or obscure: the tensions submerged earlier in the campaign now came to the fore.DERIVATIVES: sub·mer·gence / -jəns/ n.sub·mer·gi·ble / -jəbəl/ adj.