q.t. /ˌkjuːˈtiː/
Learner's definition of Q.T.
on the q.t.
informal or on the Q.T.
: in a secret or quiet way悄悄地；秘密地 -
All the arrangements were made on the q.t.所有安排都是秘密进行的。
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She told me about it on the q.t.她悄悄告诉了我这事。
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This information is private, so keep it on the q.t. [=don't tell anyone about it]这个消息涉及隐私，所以不要告诉别人。