po·co /ˈpo(ˌ)ko, ˈpɔ-/
  (ad.)少;稍
  Po·co adv.  Mus. A little; -- used chiefly in phrases indicating the time or movement; as, poco più allegro, a little faster; poco largo, rather slow.
  Poco a poco  Mus. Little by little; as, poco a poco crescendo, gradually increasing in loudness.
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