* Descend: This is the most direct opposite, meaning to move downward.
* Fall: This implies a sudden or uncontrolled descent.
* Decline: This suggests a gradual downward movement, often in terms of value or status.
* Decrease: This is often used to describe a reduction in quantity or amount.
* Drop: This refers to a sudden decrease in something, such as price or temperature.
* Sink: This implies a downward movement into something, like water.
The best antonym for "ascend" will depend on the specific situation you are considering.