de·cre·scen·do /ˌdekrəˈʃɛn(ˌ)do/
  (a.)[音樂] 漸弱的
  De·cres·cen·do a. & adv.  Mus. With decreasing volume of sound; -- a direction to performers, either written upon the staff (abbreviated Dec., or Decresc.), or indicated by the sign.
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  decrescendo
       adj : gradually decreasing in volume [syn: diminuendo]
       n : (music) a gradual decrease in loudness [syn: diminuendo]
       v : grow quieter; "The music decrescendoes here" [ant: crescendo]