She blew on a dandelion for luck.
Meaning: She exhaled air onto a dandelion in the hope that it would bring her good fortune.
Choice of Words: Blew means to force air out of the mouth. On is a preposition that indicates a surface or location. A is an indefinite article that refers to a single, unspecified item. Dandelion is a plant with yellow flowers that often has a white, fluffy seed head. For is a preposition that indicates a purpose or reason. Luck is a positive outcome that is believed to be caused by chance.
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