rallentando rallentando /ˌrælənˈtændoʊ/

adjective

1. (music) gradually decreasing in tempo  ( rallentando , rit. , ritardando , ritenuto )
   (music) gradually decreasing in tempo
   

adverb

1. (music) slowing down  ( rallentando )
   (music) slowing down
    This passage should be played rallentando
   this passage should be played rallentando