A more thorough explanation:

Definition: A collision is when two or more moving vessels come into contact with each other.

Example: Two boats are traveling in opposite directions on a river. They collide when they both try to pass through a narrow channel at the same time.

Explanation: In this example, the two boats are moving and come into contact with each other, which is a collision. The collision occurs because both boats try to pass through a narrow channel at the same time, which is a common cause of collisions on waterways.