Direct Opposites:
* Start: This is the most common direct opposite, meaning to begin something.
* Continue: This means to keep going, not stopping.
Other Opposites:
* Go: This can be a general opposite meaning to move forward, in contrast to stopping.
* Proceed: This is a more formal way of saying "continue."
* Permit: This implies allowing something to happen, the opposite of preventing it.
Depending on the context, you might also consider:
* Allow: If "stop" means to prevent, the opposite could be to allow.
* Encourage: If "stop" means to discourage, the opposite could be to encourage.
To find the most appropriate opposite, consider the specific situation where "stop" is being used.