It is used to describe the act of collecting or gathering crops from a field or garden.
Here are some examples of how it could be used in a sentence:
* "Okusamula maembe" - To harvest mangoes
* "Nilikusamula mahindi jana" - I harvested corn yesterday.
* "Tutakusamula mpunga kesho" - We will harvest rice tomorrow.
It's important to note that the specific meaning of "Okusamula" can vary slightly depending on the context and the specific crops being harvested.