on_the_q.t.
1. [ adverb ] in secrecy; not openly
Synonyms: secretly in_secret on_the_QT
Examples:

"met secretly to discuss the invasion plans" "the children secretly went to the movies when they were supposed to be at the library" "they arranged to meet in secret"

Similar spelling:   on_the_QT
  on_the_quiet
  on_the_spot
  on_the_go
  on_the_sly
  on_the_job
  on_the_side
  on_the_hook