n.: secrecy, not breathe a word, play close to one's chest, play close to the chest, keep it dark, dummy up, keep sth. to oneself, keep the lid down, one's lips are sealed, keep a [the] secret, keep a thing private, play (it) close to the vest
adj.: secret, keep a secret, ie not tell it to anyone else
Thesaurus
closely guard a secret, Avoided, silence, Du Port sufferance, to be frightened into complete silence but to exchange their hatred with eyes, speak with caution, confidentiality, stop talking unknown, silence, Shut up silence, Kin 3 seal, stop talking avoid, Shallow discretion croon, chops => lick. one's lips are sealed one will not or must not discuss or reveal sth
Antonym
broadcast the gossip, speak with fervor and assurance, Basanlansi, Tiaoba call [make] white black, Number of black on white, Number of black on yellow, criticism from the people boil, Introduction trilingual 4, On the number of black-yellow, Make irresponsible remarks, chat, talk irresponsibly, make thoughtless comments, That black spoken parts in an opera, talk of anything under the sun, On the air that there