rub out

/R AH1 B AW1 T/
verb
  1. 1

    To delete or erase or remove (something) by rubbing.

    โ€œThe teacher wanted to rub out the chalk marks on the blackboard.โ€

  2. 2

    To get by; to live.

  3. 3

    (criminal slang) To kill, especially to murder.

Source: https://en.wiktionary.org/wiki/rub%20out