Meaning: The fish is swimming quickly and powerfully against the flow of the river.
Choice of Words: The choice of words "Swift" and "Upstream" emphasizes the effort and determination of the fish as it swims against the current of the river.
Alternative Expressions
The swift fish swam against the current of the river.
Meaning: The sentence means that a particular fast-moving fish swam in the opposite direction of the flow of water in a river.
Choice of Words: The sentence describes the movement of a fish in relation to the current of a river. The indicates that we are talking about a particular fish. Swift means moving quickly. Fish is an animal that lives in water. Swam means to move through water by using fins or a tail. Against means opposite to or in opposition to. Current is the flow of water in a river. River is a natural waterway that flows from higher to lower ground.