hush

1 hush /ˈhʌʃ/ verb
hushes; hushed; hushing
1 hush
/ˈhʌʃ/
verb
hushes; hushed; hushing
Britannica Dictionary definition of HUSH
1 
[+ object] : to make (someone) quiet, calm, or still
— often used as (be) hushed
2 
[no object] : to become quiet
— usually used to tell someone to be quiet

hush up

[phrasal verb]
hush (something) up or hush up (something)
: to prevent people from knowing the truth about (something, such as a crime)
2 hush /ˈhʌʃ/ noun
2 hush
/ˈhʌʃ/
noun
Britannica Dictionary definition of HUSH
[singular]
: a time of silence, stillness, or calm especially after noise