hidden agenda
nouna secret reason behind a plan or action
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between you and me
sentencesaid to ask someone to keep a conversation secret
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to breathe / say a word about sth
phraseto tell other people what is supposed to stay secret
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conspiracy of silence
phraseused to refer to an agreement made in order keep someone from sharing or revealing information that should be otherwise publically known
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to keep a lid on sth
phraseto not let something become revealed to others
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to keep / play / hold one's cards close to one's chest / vest
phraseto refrain from revealing one's true intentions or plans
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to keep sth under one's hat
phraseto avoid sharing a secret with others
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to keep sth quiet
phraseto avoid telling about something to others
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to keep / stay schtum
phraseto decide to remain silent about something, particularly out of fear of making a situation worse
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mum is the word
sentencesaid as a promise or request to not tell something to anyone else
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one's lips are sealed
sentenceused when one says that one will not reveal secret information
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skeleton in the closet
phrasesomething about a person's past that they do not want to reveal or mention because it is embarrassing or unpleasant
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these four walls
phraseused to refer to a room, in which a group of people knows or witnesses something that others do not
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to tell tales out of / outside school
phraseto share information that is secret or private
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to keep one's own counsel
phraseto keep one's opinions, plans, or intentions secret
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to keep sth dark
phraseto not let other people know about something
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(as) close / dumb as an oyster
phrasea person who can be trusted with one's secrets
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to cover one's tracks
phraseto conceal or destroy evidence of one's activities or whereabouts to avoid detection or punishment
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to paper over the cracks
phraseto try to conceal flaws or problems temporarily, without addressing or solving them properly
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to keep sth under wraps
phraseto keep something secret or confidential and not to reveal it to others
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trade secret
nouna piece of information that one refuses to share with anyone
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