After the whistle is a commonly used phrase in sports to describe actions taken by players immediately following the end of a play. It could refer to celebrations after scoring a goal or touchdown, disputes with officials over a call, or any number of other behaviors. Some synonyms that could be used to replace after the whistle might include post-play, following the buzzer, or in the moment. These phrases offer a more specific depiction of the precise timeframe in which the actions are occurring, while still conveying the same general idea. Ultimately, the choice to use one synonym or another will depend on the desired tone and context of the piece being written.