Thank you is defined as an expression of gratitude used to show appreciation for something.interjection
When someone does you a favor and you want to express your gratitude for what they have done, this is an example of a time when you would say thank you.
The definition of a thank you is an act or expression of gratitude.noun
When you are grateful to someone for doing you a favor and you bake him a pie to show your appreciation, the pie is an example of a thank you.YourDictionary definition and usage example. Copyright © 2013 by LoveToKnow Corp.
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