Past tense of 'thank'—told someone you appreciate what they did for you.
From Old English 'thancian,' related to 'thonc' meaning 'thought.' Gratitude was originally understood as 'to think of' or remember someone's kindness.
Saying 'thank you' actually changes your brain chemistry for the better—expressing gratitude increases dopamine and serotonin, making you happier and more resilient.
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