verb
1.
Synonyms: silence , choke (off), hush, quiet, ||quieten, shush, still
2.
to cease speaking
told the boy to sit down and shut up
Synonyms: dry up, dumb (up), ||dummy (up), pipe down, ||ring off
Related Word: hush, quiet (down), shush, soft-pedal
Idioms: button ( or seal) one's lips, keep quiet