finish off

verb

To finish completely.
“Near-synonym: polish off (sometimes synonymous)”
“I was hungry, so I finished off the last of the cakes.”
To kill, to cause to die.
“It was the blow to the head that finished him off, not the bullet wound.”
“In some ways having Jon be the one to kill Dany was actually the least interesting option, but the symbolic weight of the truest believer finishing her off made sense.”
To bring to orgasm.
“It's a great idea to get good at using vibrators both on yourself (if you like them) and on partners. For many women, vibrators are part and parcel of good sex. Sometimes you'll like having unassisted sex for a while and then finish off with a vibrator. Sometimes a vibe can be great to add to penetrative sex.”