Pierce  v. (-cing) 1 a (of a sharp instrument etc.) Penetrate. B (often foll. By with) make a hole in or through with a sharp-pointed instrument. C make (a hole etc.). 2 (as piercing adj.) (of a glance, sound, light, pain, cold, etc.) Keen, sharp, or unpleasantly penetrating. 3 (often foll. By through, into) force a way through or into, penetrate. [french percer from latin pertundo bore through]