Thank/θæŋk/ Definition 1 of 4Pro Tip 1/3Expressing Thanks Use 'thank' to show you are grateful for what someone has done. I want to thank you for being so supportive. Pro Tip 2/3Immediate Response Right after receiving help or kindness, say 'thank you' to acknowledge it promptly. Thank you, you've been a great help! Pro Tip 3/3Sincere Emotion The sincerity of 'thank you' is important; it should reflect genuine gratitude. I really want to thank you from the bottom of my heart.