General Antonyms:
* End: This is the most common and direct antonym.
* Finish: Similar to "end," this implies completion.
* Stop: This suggests halting an action that has already begun.
* Cease: This implies ending something permanently.
Context-Specific Antonyms:
* Conclude: If "begin" refers to starting a process or discussion, "conclude" can be an antonym.
* Terminate: If "begin" refers to starting something that might be a job or project, "terminate" could be an antonym.
* Suspend: If "begin" refers to starting something that is then paused, "suspend" can be an antonym.
Other Possibilities:
* Abandon: This suggests giving up on something that has been started.
* Postpone: This implies delaying the start of something.
The best antonym for "begin" will depend on the specific situation and what you want to emphasize.