Lightning flashes.

Meaning: This means that a bright light is appearing for a short time due to lightning in the sky. It's like saying, A sudden and bright light is appearing in the sky due to an electrical discharge.

Choice of Words: Lightning is a natural electrical discharge that occurs in the atmosphere, often accompanied by thunder. Flashes is the third person singular present tense of the verb 'flash', which means to emit a sudden burst of light.

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Related Expressions