pinch hitter

/P IH1 N CH HH IH1 T ER0/
noun
  1. 1

    A substitute batter; one who pinch-hits.

  2. 2

    An aggressive batsman brought on to score runs quickly, even at the risk of losing his wicket.

  3. 3

    An individual who substitutes for another to perform one or more tasks.

    โ€œI'll be sending a pinch hitter to do the presentation because I have the flu.โ€

Source: https://en.wiktionary.org/wiki/pinch%20hitter