set on

1. To attack.
   • c. 1603–1604, William Shakespeare, “The Tragedie of Othello, the Moore of Venice”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies (First Folio), London: Printed by Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358 ↗, [Act V, scene i]:

     Cassio hath here been set on in the dark.

2. To encourage someone, or an animal, to attack someone.

   I will set the dogs on you, if you don't leave right now!

3. To be determined to do or achieve something.

• set upon

• Spanish: azuzar (dog)