Tree fell down.
Meaning: This means that the tree has fallen to the ground.
Choice of Words: Tree is a noun that refers to a tall woody plant with branches and leaves. Fell is a verb that means to come down from an upright position. Down is an adverb that means from a higher to a lower position. When you put them together, "Tree fell down" describes the action of a tree coming down from an upright position to a lower position.
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