On to

prep, slang

Definitions

Preposition
  1. 1
    Upon; on top of.

    "My cat just jumped on to the keyboard."

  2. 2
    Aware of. informal

    "The thought-police were on to my plans of world domination."

  3. 3
    Used to indicate, or signpost, logical progression to a new topic in a talk or discourse.

    "Now. On to the system of active water uptake."

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