start up

/S T AA1 R T AH1 P/
verb
  1. 1

    To rise suddenly.

    โ€œHe started up when he heard the scream.โ€

  2. 2

    To begin to operate.

    โ€œThe engine started up right away.โ€

  3. 3

    To begin.

    โ€œThey started up playing.โ€

Source: https://en.wiktionary.org/wiki/start%20up