1. In secrecy; not openly
   - secretly, in secret, on the Q.T.

Encyclopedia: On the QT

• highest common factor
• highfalutin
• highfaluting
• highflier
• highflyer
• highflying
• highjack
• highjacker
• highjacking
• highland
• highland fling
• Highland Scot
• Highlander
• Highlands
• Highlands of Scotland
• highlife
• highlight
• highlighter
• highlighting
• highly
• highly active antiretroviral therapy
• highly infective
• highly sensitive
• highly strung
• highly-developed