Keep quiet

be quiet, quiet!, shut up!

Verb
1. refrain from divulging sensitive information; keep quiet about confidential information; "Don't tell him any secrets--he cannot keep his mouth shut!"
(synonym) shut one's mouth, keep one's mouth shut
(antonym) spill the beans, let the cat out of the bag, talk, tattle, blab, peach, babble, sing, babble out, blab out

remain silent Could you all please keep quiet and listen to the instructor.

Synonyms and related words:
abide, be mute, be silent, be still, coast, forswear speech, freeze, keep mum, keep silent, keep still, lie still, make no sign, mark time, not breathe, not stir, play dumb, remain, remain motionless, repose, rest, say nothing, shut up, stand, stand fast, stand firm, stand mute, stand still, stay, stay put, stick, stick fast, tarry, tread water
  

phrv. พยายามเงียบ, เงียบไว้, ไม่ส่งเสียง; เก็บเป็นความลับ, ไม่เปิดเผย (syn. keep mum, keep dark)