جَرَى النَّهْرُ
The river flowed.
In context this may refer to the flow of the water within the river. If nahr is used for the water, the association is place for what it contains (maḥalliyyah), not resemblance.
Metaphor depends on similarity. Majāz mursal uses another relationship, such as cause and effect, part and whole, container and content, or other established associations. Always specify both the literal referent and the intended one.