keep (one's) lips sealed

To not say anything (about something); to keep (something) a secret. Please keep your lips sealed about our engagement, we aren't ready to tell everybody just yet.

See also: keep, lip, seal

See also:

keep (something) by
keep by
keep (something) in bounds
keep away
keep away (from someone or something)
be asking for trouble
be looking for trouble
keep (one's) eyes on (someone or something)
keep (one's) eye(s) out (for someone or something)
keep eye out

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