Once upon a time, a little bird flew high in the sky.

Meaning: This is a common phrase used to start a fairy tale or a story.

Choice of Words: Once is used to indicate that something happened in the past. Upon is a preposition that means on or above something. Time is a period of duration. When you put them together, "Once upon a time" is a phrase that sets the stage for a story and indicates that it happened long ago.

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Related Expressions