Keep one's mouth shut

Pronunciation of Keep One's Mouth Shut
/kˈiːp wˈɒnz mˈa͡ʊθ ʃˈʌt/, /kˈiːp wˈɒnz mˈa‍ʊθ ʃˈʌt/, /k_ˈiː_p w_ˈɒ_n_z m_ˈaʊ_θ ʃ_ˈʌ_t/

Antonyms for keep one's mouth shut

let the cat out of the bag, sing, blab out, talk, tattle, babble, peach, blab, babble out, spill the beans.