It's not a complete sentence. It might be okay in a casual conversation where both speakers know what the subject and object of the sentence are:
"What did John do with those fish?"
"[John] Ate them ["those fish"] down by the river."
The river and a bee was talking very free.................... the bee then swam down into the river and the river ate the bee
This river is navigable - means you can get your boat down it......
This sentence does: They sailed down river to the delta.
He ate tacos on his row row row your taco boat down the river :)
Ate is intransitive in that sentence. There is no direct object."You ate pizza in the cafeteria" is an example of ate as a transitive verb (pizza is the direct object).
what is the gerund phrase in this sentence, Floating down the river on a raft was not Joel's idea of fun.
In the sentence, "You ate an apple." the noun is apple, a word for a thing.
the duck has to quibble down to the river to survive!
In the sentence "Floating down the river on a raft was not Joel's idea of fun," the gerund phrase is "Floating down the river on a raft." This phrase functions as the subject of the sentence and describes the activity that Joel does not consider enjoyable. The gerund "floating" acts as a noun, representing the action of drifting on the river.
he ate between bone bread cartoon ,down fish fried washed the slices down with some milk.
She slid down, quickly engulfed by the depths of the river.
I slithered down the muddy bank of Indus river.