At it

//ˈat ɪt// prep_phrase

Definitions

Prep_phrase
  1. 1
    Occupied with a given activity; busy with something.

    "Mart. Oh they are at it. Lart. Their noise be our instruction."

  2. 2
    Engaged in sexual intercourse or other sexual activity.

    "I came home early and caught them at it in the front room."

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