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Adverb: on the sly
  1. In a furtive manner
    - furtively

Nearest

on the one hand
on the other hand
on the Q.T.
on the QT
on the qui vive
on the road
on the rocks
on the ropes
on the run
on the side
on the sly
on the spot
on the spur of the moment
on the table
on the trot
on the up-and-up
on the way
on the whole
on the wing
on thin ice
on time