The river flowed swiftly, carrying the boat downstream.

Meaning: This phrase describes the rapid movement of the river carrying the boat along its course.

Choice of Words: Swiftly means moving or happening quickly and easily. Downstream means in the direction that a river flows. When you put them together, "the river flowed swiftly, carrying the boat downstream" is a phrase describing the rapid movement of the river carrying the boat along its course.

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Related Expressions