A team or athlete is considered out-of-form if their results are way below what was expected. If an outsider loses frequently, it isn't out-of-form, just a weak team. But if the leader starts losing points, that's out-of-form.
Out-of-form team
Out-of-form team
It depends on the quality of the latest results, player moods, and their relationship with their coach. For example, if a team leader is injured or there's a conflict between coach and players, the team's results in the next rounds will surely decline.
Out-of-form athlete
Out-of-form athlete
Occurs due to poor team results or personal issues. A player might be out-of-form due to a long flight, family problems, or conflicts with the coach or other players.