hush up
/hˈʌʃ ˈʌp/
/hˈʌʃ ˈʌp/
Etymology
English
Built from the verb 'hush', meaning to make or become quiet, plus 'up', which here adds the sense of bringing something to a close or shutting it away. From around the 1600s 'hush' was used for silencing people, and 'hush up' grew to mean silencing not just voices but whole stories someone wants buried.