On Fire
= doing very good, a streak of good results
(“On fire” is used often to describe athletes who are on a great streak.)
Ex: Sarah is “on fire” at her new job. She will get promoted quickly.
Ex: The basketball player was “on fire.” He never missed a shot in the game.
Hot
You may see a similar description of “being hot.”
Ex: The team is “hot” right now after winning five games in a row.
Ex: The soccer player is really “hot” right now, scoring a goal in each of the past four games.
Cold
The opposite description of one’s performance of being “hot” is being “cold.”