not open mouth

not open (one's) mouth

To be completely silent; to remain discreet (about something); to not tell anyone (about something). All the while our teacher was shouting at us, we didn't open our mouths. Don't open your mouth about this! I would die of embarrassment if anyone were to find out.

not open one's mouth

and not utter a word

Fig. not to say anything at all; not to tell something (to anyone). Don't worry, I'll keep your secret. I won't even open my mouth. Have no fear. I won't utter a word.

See also: mouth, not, open

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not much to boast about
not much to choose from
not much to look at
not much to speak of
not much upstairs
not my dog
not nearly
not necessarily
not on
not on any account
not on my watch
not on your life
not on your nelly
not on your tintype
not one bit
not one iota
not one little bit
not one red cent
not one whit
not one/a jot
not one's day, this is
not oneself
not only (something), but (also) (something else)
not only... but...
not open (one's) mouth
not open mouth
not open one's mouth
not out of the wood
not out of the woods
not pass (one's) lips
not pass your lips
not pay (one) any mind
not pay someone any mind
not place
not play that game
not playing with a full deck
not pull (one's) punches
not pull any punches
not pull your punches
not put (one's) finger on (something)
not put (something) past (one)
not put a foot wrong
not put it past
not put it past (someone)
not put it past someone
not put something past someone
not put stock in (something)
not put your finger on something
not quite
not quite the thing
not rest on (one's) laurels
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not one whit
not one's bag
not one's brother's keeper
not one's cup of tea
not one's day
not one's day, this is
not one's department
not one's jam
not one's long suit
not one's place
not one's place to
not one's problem
not one's scene
not one's thing
not one/a jot
not one’s bag
not one’s jam
not oneself
not only
not only (something), but (also) (something else)
Not Only Structured Query Language
Not Only Stupid, But Expensive
Not Only That
not only, but
not only... but...
Not Open
Not Open
not open (one's) mouth
not open her mouth
not open his mouth
not open mouth
not open my mouth
not open one's mouth
not open our mouths
not open their mouths
not open your mouth
not openly expressed
Not Operational Ready
Not Operationally Qualified
Not Operationally Ready Reporting System
not operationally ready, maintenance
not operationally ready, supply
Not Operationally Ready, Supply Aviation Item Report
Not Optimized Properly
Not Optional
Not Or
Not Ordinarily Resident
Not Organ-Confined Cancer
Not Original Manufacturer
Not Original Motor
Not Otherwise Authorized
Not Otherwise Classified
Not Otherwise Coded
Not Otherwise Enumerated
Not Otherwise Herein Provided
Not Otherwise Identified
Not Otherwise Identified by Name
Not Otherwise Indexed by Number
Not Otherwise Indicated
Not Otherwise Indicated By Name
Not Otherwise Provided
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