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The spellings thank you and thank-you are both correct, but they have different uses.
Without a hyphen, thank you is a verb with a direct object. We use this phrase to show our gratitude to someone:
With a hyphen, thank-you is either a noun or an adjective. As a noun, it means “a message of thanks”:
As an adjective, thank-you is used before a noun and means “expressing thanks”:
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