Lullaby opener
I believe the answer is:
hush
(Other definitions for hush that I've seen before include "(Call for) quiet" , "Noiselessness" , "Soothe" , "Quieten" , "Make (someone) quiet" .)
I believe the answer is:
hush
(Other definitions for hush that I've seen before include "(Call for) quiet" , "Noiselessness" , "Soothe" , "Quieten" , "Make (someone) quiet" .)