1. (verb) refrain from divulging sensitive information; keep quiet about confidential information

• keep one's mouth shut
• shut one's mouth

1. (verb) refrain from divulging sensitive information; keep quiet about confidential information

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