For interrupting someone:
* Halt: This is formal and direct, implying a strong need to stop.
* Hold on: This is more casual and suggests a temporary pause.
* Stop: This is simple and straightforward, but can be abrupt.
* Wait: This is similar to "hold on" but emphasizes the speaker waiting for something.
* Excuse me: This is polite and indicates you want to interject.
For ending a conversation:
* End: This is neutral and simply means to finish.
* Finish: Similar to "end," but can imply a sense of completion.
* Conclude: This is more formal and suggests a final statement.
* Cut off: This is abrupt and can be rude, implying a forced end.
For pausing while speaking:
* Pause: This is neutral and simply means a temporary stop.
* Hesitate: This implies uncertainty or doubt.
* Stumble: This suggests difficulty speaking smoothly.
* Catch your breath: This is more informal and means to take a break to breathe.
The best word for you will depend on the specific situation and the level of formality you want to convey.