q.t.
/ˌkjuːˈtiː/
Britannica Dictionary definition of Q.T.
on the q.t.
informal
or
on the Q.T.
:
in a secret or quiet way
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All the arrangements were made on the q.t.
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She told me about it on the q.t.
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This information is private, so keep it on the q.t. [=don't tell anyone about it]