Explanation:

- The word "divide" generally means to separate or break into parts.

- Unite: To unite means to bring together or combine into a whole. It is the opposite of divide.

- Break: Breaking is splitting something apart or causing it to come apart. This is more synonymous with divide rather than its opposite.

- Split: To split means to divide or separate something into parts. It aligns closely with divide.

- Engulf: This means to completely surround or cover something. While not directly opposite or synonymous, it doesn't match as the antonym of divide.