finish off

verb3

1. •
   To finish completely.

   • I was hungry, so I finished off the last of the cakes.
   • I finished off all the outstanding orders before I clocked out.
2. •
   To kill, to cause to die.

   • It was the blow to the head that finished him off, not the bullet wound.
3. •
   (slang) To bring to orgasm.