of mourn-the act of sorrowing or expressing grief; lamentation; sorrow.-garb, drapery, or emblems indicative of grief, esp. clothing or a badge of somber black.-grieving; sorrowing; lamenting.-employed to express sorrow or grief; worn or used as appropriate to the condition of one bereaved or sorrowing; as, mourning garments; a mourning ring; a mourning pin, and the like.