polish off

(verb) finish a task completely. Synonyms: get through, wrap up, finish off, mop up, polish off, clear up, finish up. Example: "I finally got through this homework assignment."

(verb) kill intentionally and with premeditation. Synonyms: murder, slay, hit, dispatch, bump off, off, polish off, remove. Example: "The mafia boss ordered his enemies murdered."

(verb) finish eating all the food on one's plate or on the table. Synonyms: eat up, finish, polish off. Example: "She polished off the remaining potatoes."